Document 70NBKxo5JaMBEgJD9brB2O1pR

The American Ceramic Society February 15,1993 I hereby certify that the attached copies of Ceramic Abstracts, Volume, 1948, are true and accurate copies, which are maintained in the normal course of business at the American Ceramic Society, 735 Ceramic Place, Westerville, Ohio 43081. I cannot verify the accuracy of copies from Industrial Medicine, Volume 17,1948. Ceramic Information Center 735 Ceramic Place Westerville, Ohio 43081-8720 614*890*4700 TWX: 7101109409 PLAINTIFF'S EXHIBIT -Q6Sb3fr& .tnber *1 curves, vaatt timpusi* * Ur 3 51*. i- . (IX) +1 1675. ^ n work. *>. ad> ~ 'fiction. .tnauon. ui. (8) 71 142/; , >al-*bock CERAMIC ABSTRACTS Compiled by The American Ceramic Society 1948 Charles S. Pearce. Editor Mary J. Gibb. Assistant Editor Dorothy Donohue. Editorial Assistant Committee on Publications: K. C. Lyon. Chairman; Karl Schwartzwaldex, R. E. Birch, and J. J. Canfield Technical Advisers: L. G. Farbex. Ralph Rose, and A. \V. Allen A. H. Adams F. C. Arrance Wilfred Ashworth X. X. Ault Walter Bank L. R. Barrett R. Bdrta L. Barzaghi W. R. Beck J. J. Beinlich A. C. Bevan ABSTRACTERS Associated Technical Services British Ceramic Research Association Bureau International d'Etudes Techniques Ceramiques A. J. Biddulph R. H. Bollinger Claudia Boynton Ian Campbell G. S. Douglas W. D. Foster .1. J. Frankel R. A. Gregory P. Grodzinski A. J. Haecker, Jr. Mas Hartenhcim M. P. Haydon F. G. Heck I. Hochman R. H. Hooker G. M. Hutt Collin Hvde J. F. Hyde L. J. Jacobs B. Z. Kamich D. F. King M. M. W. Kleinian X. J. Kreidl S. M. Lang E. D. Maher F. R. Matson L. R. McCreight L. M. Merritt T. G. Mohr j. M. Xoy S. S. Obenshain T. G. Pett D. G. Pierce Publication Office: 20th and Xorthampton Streets. Easton, Pa. Editorial Office: 2525 Xorth High Street, Columbus 2, Ohio Alexis Pincus W. J. Plankenhorn J. E. Priestley A. T. Prince H; K. Richardson X. Schrewelius A. B. Searlc J. O. Seirnnelman F. P. Shonkwiler Hans Thurnauer W. O. Williamson UI bL ii.b'D knoy CN 260 Ceramic Abstracts 194.' inert gas curtains insitle furnaces, and simplified. smaller How to make a silk screen. Anon. Ceram. [ad so plants; i3) predictions for whiteware winch iuclude [til 1*7 l 19481. C.G.B greatly shortened maturing schedules, eustotn-rruule kilns, How to set up a simple perpetual inventory system. unbreakable china, uucontaminated raw material, handling B. L. GofCH. .l/ii. Paint J., 32 [30| 40--40 (UM8I. timed to make storage unnecessary, automatic hatching, system through which any manufacturer or supplier . .| casting in a fraction of the present time, faster jiggering. numerous articles can determine profitable items, reserve radiant heat and atomic fuel, and rapid decorating; (4) stock quantities, and control production, mark-ups. predictions for glass which include smaller plants, pneu reserves of raw materials can tie set up using 8 X 5 in. ii;t. matic material handling, presintering for fast melts, trend . cards in a visible reference type file. Suggestions arc toward automatic forming, combination annealing and . offered concerning actual data to be entered on each card. heat-treating, lightweight glass, throw-away containers, A fictitious case illustrates the value of such a system. and oxygen melting. Twelve charts with curves predict AJ.ll. the rise and fall of market conditions for major appliances, i Immersion'media containing methylene iodide. Rou. architectural porcelain, porcelain sanitary ware, hollow ERT L. Darnbal. Am. Mineral.. 33, 340-52 (19431.--The ware, dinnemare. door and wall tile, vitreous sanitary usefulness of methylene iodide in immersion media ware, electrical porcelain, glass containers, dat glass, gla-- empluisized. The nonlinear relationship of indices of re tableware, and structural glass.- C.G.B. fraction ta composition by volume of some liquids contain- Controlling abnormal dust exposures. M. W. Thump- ' ing methylene iodide is shown by experimental data. An son*. Occupational Hazards. 10 (4| 12-13 1.1948).--Tae empirical equation hits been devised for calculating :'... removal of dust from places of origin by mechanical means indices of mixtures oi methylene iodide and L-bromonapli- and by moistening materials and air. as adopted by the thalene from volume percentage data: na * 1.65S7 -- American dinnerware industry, is discussed. hi. Ha. e 1/ 10s (4533.C 4- 37.cs). where ro is index and x is CH;t; osh5arwsomifopXtneihia%ofnfnufzeogtsensDieeeemhgrd..uedeadrrruilsfshs2iattibor.deoshmydci9aiploreiibod.orvtchauiaydyctundia1arintnio,tletnim;1dmei3gdathnyga7,%eiooeobnfao.n2osobcldelid-dfdicnotbor7vsahliegTnanwe6oncciexsssnt.ooglui--epareshit1emnphonoto8odtrioTssptlhuro%bteafuahrhlawauctedrnoeaemsneflhsciadtcibtseunrlgha.ayh0taeeiromvr,elt.yslaet7caeodraeuieaoPdyrnwarfmlcnsai.ytisirdnrsaoftti.im,eisretnencaheXottadgda.ataunsfiT,itnlstawcu2gccietoehgdoer5toF,idfhneiftesaasliohtha;ntntaocsoorauaneienssssapnsf3dvs.aitgeteottio07rynaceidsevmln%o%otegse>aFffflagu.suto%aoaohbcstimfnvirnasaofeilnlebacdgihfsgrcaAonctfvccet;iuasipkaorran.cneiniFMtlelnosngesaucahc.,mtosrteonAse.traco,fpHisedntpo.ulgif1igonctveranpo9araovishgIceat4.uflileoeeysuonti3lrrhndsad)so.y-,' '-_--" reaae(s9Wsttwr5iXnviaeafrtn2xoeraeoasrnfpMaMdenrueotpl(teetlea.atb1tnbeei.tnyrpmrrleR9ebi%taa;c.emrfhg4Seoeeattrwooosi)7tesarcsnch.rdf!)e.fnaetnsFbe.eose--whltrI,i.otarnvkybyCiso3osfla.gSAgiaUrtaogtcisimttinXelut0ofvhh,hcloTinareneutqogaewihielvsmnlubsuol.naesaoeeztguidate,uedtf.segasnesrr.ledCd3ieeodremsld6oijscdfoAuztiei,oonTfanasmmioatgmd[ph1htdt6rrfnmii.i0eeyosctmu|saie0zclemnheseoeree2swgintndlorddlru-3dolesteevisa.toa-giieoehcia2noloflgukfoosie9nHonl.thtmaweo.hidayenpniueigpinnc3sadrgcsAae.oo3llessotiumtstt6pomh-Aheessi8oiat.spieeecseisop4np.olcst.dozeio.naebnv,1dy.R(t,sg.epa2e1itfsw.raotlTe9QaecrahpnGliu4urheltnuteeouths7bome.Wiatqwsrs)bfisraoe.eh6Xdafete.--tiWni.1bdDiciecps,dors0gt,oatrm.iE.ov8isanwFtuAlwbmiiurmilefzo.tc.oy.eiine.ittn71iork4nocsnhLk7du5,f... Dropped-caisson shaft sinking. William S. Colb, Jr.' The hands are not affected by immersion in the Rocal. Eng. Mining J., 149 [4| 82-83 (t948).--Bauxite deposits Zephiran chloride is also satisfactory but more expensive. in Saline and Pulaski Counties. Ark., require many shallow W.D.F. shafts in proportion to the tonnage mined. Conventional -- Pulmonary dust disease. A. R. Riddell. Ind. Med.. shaft sinking is not advisable due to layers of quicksand. 17, 168-70 (1948).--Silicosis is the most important hut y A concrete caisson was made 18 in. thick and with an inside there are other dust diseases. The status of aluminum as diameter of 8 ft. for a shaft. It was planned to dig out the a therapeutic agent for silicosis has not yet been deter- middle, drop the caisson, and put another ring of concrete f mined. Fumes from heating bauxite to make corundum and repeat, but considerable trouble was encountered: can cause trouble. The fume contains much alumina, however, it was finally completed to a 204 ft. depth. Fu silica, etc. Early cases are symptom-free with a slight ture projects should (l) avoid test holes closer than 20 ft.. lung shadowing. Later the symptoms may simulate (2) ha.e adjustable guides for aligning the shell, (3)* have _ pneumonia and heart disease and the shadowing spreads. guide runners to keep the caisson aligned, (4) have a gasket' Cadmium or cadmium compounds, either as fume or dust, to stop sand blows, and (5) use water-tight joints between cause a serious lung disease. During the war beryllium all pours. 4 figures. W.D.F. poisoning became known. Asbestosis has long been Factors which will influence ceramics in next 23 years. known. Workers in a very dusty talc mill showed lung Anon. Ceram, Ind., 30 [61 So (1948).--Fifteen factors 9 damage, but the miners did. not. The talc was fibrous and which will influence the next quarter century in ceramics contained 30 to 50% free silica. There are some benign are as follows: Americans will live better; there will be pneumoconioses, such as siderosis. which do not affect the more family units; the population trend is up; the average length of life. 7 references. W.D.F. age will be slightly older; military preparation will be -- Photoceramic technique.. S. A. Berzon. Abstracted planned in billions; commercial construction has only in Stekol'naya i Kerant. Prom.. 1947, Xo. 9. pp. 17-18.-- started;, institutional and government needs involve huge Details are given for transferring images from glass onto construction; the European Recovery Program will tax ceramic ware. The following reagents are used: f l) for American production; competitive raw materials are being cleaning the glass, a solution containing 4 gm. of ammo depleted; home and rental construction will increase; nium dichromate, 10 gm. of dextrin, and 20 gm. of sugar in backlogs still exist and may be increased; technological UK) cc. of water; (2) for transferring the image from the developments will broaden markets; industrial construc glass onto the ceramic ware, a solution consisting of 59 col tion will continue strong; competitive product develop lodion. 30 ether, and 20% of 96 alcohol; (3) a dark-brown ments will challenge ceramics; and labor relations will be color containing the pigments Fe(OH)i. CO(OH):. ami mutually more enlightened. C.G.B. ZnO in the proportion of 2:1:1 and a black color containing Failure to block doorways of freight cars causes severs the pigments Fe(0.-0j. MnCOi, and CO(OH)- in the pro; damage to packaged freight. Anon. ,4m. Paint J.. 31 portion of 2:1:4. The flux for these colors consists /> [281 76-80 (1948).--A series of documentary photographs PbjO, 75, quartz 12.7, and boric acid 12.5%. B.Z.K taken by* the Shipping Container Institute show freight Report on British Industries Fair. Jack Brooks. damage, its causes, and the results. The value of blockin; Ceram. Ind., SO [| 131 (1948).- C.G.B. doorways to prevent load shifting is stressed, and methods Research on asbestos fibers. M. S. Badollbt. i tans. are suggested to prevent such shifting. A.J.H. Can. fnst. Mining Met., 31, 213-16 (194.8).--The John- Man sive clud< . filler impr in* l Sr Tav. for were whic wliil Si 21Hof *i erys; cryp tripe vitri giver and trou land tion. insui and smel silic: aboi III n Sv 1-6' Carr forrr T1 P. P (194 Tr * in tl Pod aids Po: Tav pott< Pott potti U. sear. deal used W [61 indu of ra A tv Amt Sth Figc give e A. FIA abst Pho indu serif 1 ia7'5t r,: proc scrit vote min. and a pc Pulmonary Dust Disease A. R. RIDDELL. B.A., M.B., D.P.H. Opinions concerning dusts and pulmonary considerable value in the estimate of disability. disease have changed somewhat during the A review of the symptoms and signs presented last few years. For a considerable period followby 637 persons with silicosis was recently made. ing 1918 attention was chiefly centered on silica. This offered information which may be usefully Dusts were classified as active or inert according applied. The investigation confirmed the finding as the reaction they occasioned in the lungs re that dyspnea is the commonest symptom and lim sembled or differed from that produced by silica. ited expansion the commonest sign. It also dis Although silica is still recognized as the most closed, that of 203 persons with a history of important dust concerned with dust lung in having had night sweats, 117, or approximately jury, it has gradually become apparent that dusts 53%, had positive sputum. Bacilli were demon other than silica and the silicate asbestos may be strated either at the original examination, or involved in pulmonary disorders. later on follow up. It indicated, that 70, or S0%. A description of silicosis is superfluous at of those with hemoptysis were tuberculous, and present. 'The disease has received so much atten that 184, or 75%. of those whose fingers were tion and has been discussed so often that you are clubbed or who had curving of the finger nails, all conversant with its general features. You had positive sputum, or were dead when the an realize that silica dust inhalation, if the quantity alysis was made. of dust inhaled is adequate, may result in lung It will be realized that for practical purposes, fibrosis of a special nature. Collagenous nodule diagnosis in silicosis involves the differentiation formation js characteristic of this process, but of type as well as recognition of the disease. its regular deposition may be altered often pro Commonly this is made on the radiographic ap foundly by accompanying infectious processes, pearance a case presents. Cases with clear cut or by admixture of the dusts of other materials uniform nodulation are Interpreted as simple, with silica. It is general knowledge that silicosis and those with conglomerate or massive shadow is prone to association with tuberculosis, but ing as complicated. Although this may be a use the implication may not be so fully appreciated. ful working rule in relation to the interpretation The late dr. Gardner1 is reported to have ad- of radiograms, there are many exceptions to it - vanced the opinion that, when chronic, a com Xot infrequently the radiographically simple case bination of silicosis with tuberculosis constituted will prove to be complicated, and no evidence of a disease quite different from either of the other an infectious process can be demonstrated in the two contributing conditions. Certainly it is dif radiographically complicated, even at autopsy. ficult to treat. As a rule it gradually progresses Compensation complicates the silicosis prob in spite of what is attempted, and surgical mea lem. With diagnosis so dependent on the inter sures are unsatisfactory. This disease may be pretation of radiographic shadowing as is the- seriously disabling, although those affected are case at present, it is well to remember that heavy not always obviously ill. or prominent shadowing in the lung fields or The importance of tuberculosis in conjunction even nodulation, does not necessarily denote fibro \ with silicosis is illustrated by information sup sis or silicosis. These appearances, commonly plied by consideration of the causes of death in ascribed to the effects of silica, may be simulated a series of 436 silicotics on whom we have rec by lung changes related to other conditions than ords. The persons concerned had been employed silicosis, in which there is often no fibrosis. in various occupations carrying a silica hazard. When cases presenting such radiographic ap A little more than half of them were miners. pearance lack a history* of dust exposure the Pulmonary tuberculosis caused the deaths of situation may not be too difficult, but with such 62% of the persons comprising the whole series, a history they may cause considerable confusion. and was responsible for 68% in the mining group. We have found the more important of these con Estimations of disability are notoriously fusing conditions to be--heart diseases, particu troublesome in silicotics. It would seem that larly mitral stenosis, certain fungus infec these are too often based on radiographic ap tions, benign pneumoconioses, disseminated new pearances together with attempted measurements growths of the lung, and sometimes pulmonary of breathing capacity, and that other useful in tuberculosis with a miliary distribution. formation is apt to be neglected. In assessing Aluminum dust employed in the treatment of, disability the clinical picture should be viewed or as a prophylactic in silicosis, has received as a whole. Careful consideration of the infor much attention in this regard during the last few mation afforded by the symptomatology and clin years. It is administered in two forms, as finely ical findings in the individual cases, may be of divided metallic aluminum, and as .aluminum hy droxide. The metallic powder is the more im Prmntnl at th Annual Mntini of tha Mu-hicax Assotia. Tin* nr I.noi-stmal PiiYrus. ano Srawn*. I.iwinr. Mi-hi. can. March 1. IMS. portant agent, and at present many persons^ are receiving it both here and abroad. Its adminis- livability, presents tly made, s usefully le finding 1 and lim. also dislistory of oximately )re demon* lation, or l, or 80',. ilous, ami gers were ;ger nails, n the an- ^ purposes. rentiatin:. e disease, raphic u| dear cut as simple. . >, dow* use- station ions to it. simple case videncc of ted in the autopsy. )osis prohtlie intcr- as is the that heavy { fields r note fibncommonly )> simulated itions than to fibrosis, raphic apposure the with such " confusion. these con's, partieugus infeoinated new pulmonary ion. atment of. .is receive.: ':he * st t\ 1 .bm; , ,,m .ore in:- l>ersons ;i!V ts admi'.:- -S'VOL. 17, No. 5 INDUSTRIAL -MEDICINE Page 16'J jjf. !?- tration has not been observed to be attended by of many other substances. Which of these is injury, neither however, is there convincing evi- responsible has not yet been determined. In : dence that it has been of objective benefit to the presence of so much silica, this material can sfiicotics. Nevertheless, many persons receiving. not be absolved, on the other hand rather sim .or who have received aluminum for silicosis claim ilar lung damage has been reported from Ger ;V subjective improvement many1 in exposures in which aluminum at least ^v The status of aluminum as a therapeutic agent figured. MIDDLETON4 also reported a case in Eng ^has not yet been determined. It seems to offer land in which exposure jo aluminum was asso ^possibilities as a prophylactic, but as considerable ciated with lung changes. 'V'fi'me is still necessary to establish its usefulness, The inhalation of cadmium or cadmium com O.-B0 laxity in regard to recognized methods of dust pounds, either as fume or dust is attended by control should be countenanced. respiratory damage of a serious nature. In an Early in 1942 an occupational lung disease Ontario exposure 15 workmen from two plants . 'new to this continent was discovered by OB. C. c. were injured in this way in 1935--two died. jS'SKAVER, Superintendent of a sanatorium situ- Dust is produced when the metal is being " ~' id near St. Catherines, Ontario. A description ground or polished. Fumes are evolved during the disease and the circumstances which re welding operations, or when the metal is sub ded it has already been published.3 The de- jected to high temperatures by accident, or for JS; tails need not be repeated. In the process in* the purpose of removing cadmium plate. Evolving bauxite, aluminum ore is converted to When small quantities of cadmium are in ^corundum, a hard metal used in the abrasive in* haled. dryness of the throat, cough, a sense of ^V-dustry. While the process is-in operation, the restriction in the chest, headache and vomiting ^`attendant workmen are exposed to dense fumes are produced. Heavy exposure is followed by X^.from the materials being treated. severe lung changes, accompanied by marked The process is not new. It has been carried on dyspnea, persistent cough, cyanosis and prostra 'f% for upward of 20 years in some of the plants tion, which may be prolonged. The disease has ^concerned, yet it was not previously known to the characteristics of a chemical pneumonia, and TrV.be injurious. This may be explained on the this Is confirmed by postmortem findings. Con *3;-basis, either that in the past it did not occasion valescence is apt to be protracted, but they even "^vicing injury, or the disease was not recognized tually return to work without disability. f. because its accompanying signs and symptoms In one instance radiographs were prepared Jwere ascribed to other causes. The latter is the during the acute illness. In this, the lung fields >re probable. Early cases are symptom free, were seen to be occupied by intense nodular ;the signs, exclusively radiographic, are often so shadowing, closely resembling that to be observed [slight that they would be readily missed by one in certain cases of silicosis. Radiographic exam *not conversant with the situation and on the ination of the survivors of the affected was car ik out for them. Later cases as characterized ried out some years later. In none was there 'attacks of sudden extreme dyspnea and chest evidence of any permanent lung injury. [pain which have, on occasion, been interpreted as It was during the war years that beryllium licating heart disease or pneumonia. poisoning was drawn to our attention.8 Exposure The radiographic characteristics of the con to beryllium or to certain of its compounds is ation may be divided into "early" manifesta attended in certain individuals by skin troubles. ins and "well established" disease. The early It is also attended by lung disease, often of a inifestations are extremely slight. They con- serious nature. The disease has special.features: of an indefinite granular appearance in the Symptoms may develop during exposure, or they rices with slight rather lace-like shadowing may be delayed, perhaps, for months or years rich appears in the sub-apical area and-which after exposure has ceased. Two types- of the 5Fmay extend to the first interspace. As the con- disease are recognized, an acute type and a de ion advances the lace-like shadowing is found layed. The acute form has characteristics which [extending lower in the lung fields. A further ex- suggest a chemical pneumonitis. It results from sion is accompanied by the loss of the lace exposure to high concentrations of beryllium like character of the shadowing. Eventually the compounds. It may be severe and even fatal, ole lung field may be occupied by shadowing but ir. those who survive, the condition has a which has a rather granular, or even an irregular tendency to clear. The delayed form appears to "ular appearance. have little relation to intensity of exposure. It Coincident with the peculiar lung shadowing is more ap: to occur where relatively light, but s1he diaphragm is generally markedly distorted. more prolonged exposure has been sustained. A and the mediastinum is widened. The "well es- feature of the delayed form is the occurrences of ' tablished" case is characterized by the occur- scattered granulomatous areas in the lung tis frence of spontaneous pneamothoraces, very often sue which may undergo organization. In some ;-y bi-lateral. These occurrences are associated with cases the radiographic appearances closely re ^tbe rather dramatic appearance of desperate semble silicosis, it was therefore thought at one ".dyspnea and severe chest pain. time that the disease might be a modified sili The fume is the source of this lung damage. cosis. The etiology is still obscure. While in It contains considerable quantities of very finely vestigating this matter, it was dr. Gardner's4 'divided alumina and silica, and small amounts opinion that some other factor than beryllium M:. Page 170 INDUSTRIAL MEDICINE Mag. 10is might be involved. This apparently has not yet been established. Considerable data is being col lected and may serve to resolve the question. The dust of asbestos, a fibrous silicate, induces a lung fibrosis which may be disabling. The disease asbestosis differs considerably from sili cosis. Although areas of fibrous tissue develop throughout the lungs, these do not exhibit the nodular pattern that distinguishes that condi tion. Radiologically it is also different Charac teristically the heart shadow is shaggy, and the lung fields have a granular or "ground glass" appearance, but definite nodulation is not appar ent Circulatory embarrassment is common in asbestosis. The disease however, does not appear to predispose to tuberculous infections. Aside from asbestos, silicates are not usually related to lung injury. In this respect talc, a hydrated magnesium silicate, may be an excep tion. Although no clear evidence of injury has been produced in connection with persons hand ling talc, in many industrial operations such as tire building, paper making, etc., injury has been demonstrated in relation to the production of this substance. Some years ago in Ontario the miners and milhvorkers from a small talc pro ducing plant were surveyed. None of the miners showed radiographic changes suggesting disease, but examination of 37 mill men engaged in crushing ore discovered 13 in whom chest films gave evidence of lung fibrosis. The exposure periods in these cases were from five to 18 years. The average exposure was 12 years. The radiographic appearances were not uni form. In some, diffuse fine granular shadowing was seen throughout the lung fields. In others, nodular shadowing resembling but rather softer in character than that of silicosis was present Several presented a combination of these appear ances, with or without areas of massive shadow ing. Repeat examinations of many of those af fected reveals that in none has there been any clearing, but that several have progressed. The talc, a fibrous and flaky variety containing a small quantity of tremolite, occurs in forma tion consisting largely of crystalline limestone. In this formation numerous stringers of quartz are found. In the past, dust conditions in the mills were very bad, and great clouds of dust, visible from a considerable distance, could be seen escaping when crushing was in progress. Dust sampling was done in these mills. The samples varied considerably in silica content, depending on where they were co'Iected. Air samples contained approximately 34% silica, and settled dust from the beams about 55%. Thu free silica content was estimated at 1% to 2%. It is evident that in 1943 siegal7 and others encountered a situation somewhat similar to this in St. Lawrence County, New York. Doubts are entertained respecting the On tario exposure. Having regard to dust conditions and the quartz in the limestone carrying the talc, the abnormal finding? may very well reflect a silicosis modified by other dust; On the other hand, the matter of the extremely heavy dosage must be considered. Although several of outcases have died, we have not so far secured autopsy material. This is essential to a solution of the problem. Certain lung conditions termed benign pneu moconioses. of which siderosis is an example are not infrequently encountered. These con ditions are not in the least disabling and they do not affect life expectancy. They arise in re lation to occupations in which dust of metals or other inert materials are produced. Particles of these materials opaque to the roentgen rays, on reaching the lung tissues are deposited in re lation to the lymphatics, where they remain in active Causing no injury. These conditions are not properly termed dis ease. I have referred to them merely because they may occasion radiographic appearances scarcely to be distinguished from those due to silicosis. It should be remembered however, that infectious processes may occur in persons with benign pneumoconiosis. In such cases the. in fection is the disease to consider. V'our attention has been directed to a few ** dusts which are involved in the production of pulmonary diseases, and certain characteristics of the disease they occasion, have been referred to. The subject has not been exhausted how ever: The connection between bagasse, sugar cane from which the sap has been extracted, and lung disease, should not be overlooked. Neither, should it be forgotten that dusts such as arsenic and those of certain radioactive materials have been related to the occurrence of neo-plastic lung conditions. You will recall that cotton workers are subject to an occupational disease, in which the materials they handle are in some way con cerned, and that cotton dust may be involved. We have in Ontario, plants in which the work ers are in exposure to radioactive materials, arsenic and cotton. Most of the plants have med ical departments, and x-ray surveys of the work ing staffs have been conducted from time to time. In spite of this careful supervision however, no convincing evidence has yet been forthcoming which would indicate that any of these materials are implicated in the causation of this type of lung injury in Ontario. Complacence, especially in regard to occupa tional dusts of any nature, is always dangerous. Also new substances are frequently being intro duced into industrial operations, and older sub stances used in new wavs and combinations. The result of these changes is often unpredictable. Constant vigilance is therefore necessary. Bibliography l. LanIa. A. !.: sr-Mtt M.A.. 1S. ! Shaves, c. r... KrwtfU. A. fL: /. t-dr**:. 1*47. 5. G*iMICv>k:. r**tif 4Jtr: Arrh. f. -i * G-trerb** 4. Midoletun. E. L.: Utti. t. ,\t m. .< April. 1M*. y Van Oiu?s.%.n'D. H. 5.. H>*uku, R.. Canmpcsv. M. Cterrfamtt r!>j. 1\; ll>. t'.'ii Pcr*onol rvmrTvjr.u'utifcrt. 7. Sikcal. w.. Smith. Adsi-a::* R.. r.-ttsKi r:. L.: Am. J. /.Vef. C Hittt. 4*.*: i'.