Document JBVMgMn7ZaMjm2v19859kLvO

^iAimrr's exhibit ho. o. I 4. ' ^v t ao. tfgl -5 8!mea < -1 INDUSTRIAL HEALTH NEWS LITERATURE ABSTRACTS MEDICAL ENGINEERING ' CHEMICAL TOXICOLOGICAL LEGAL * * * dtciiion* tad frtndj '%V <' AUGUST, 1949 (VoL 13f No. S) I% *4 INDUSTRIAL HYGIENE FOUNDATION ++oo nrm avenue Pittsburgh is. pa. is Hygiene Direst _ i =; Hcvever, great care should be taken to exclude the tuberculous in select ing persons to receive aluminum therapy. (U) It la not believed that a scisntifically controlled experiment in industry i3 feasible for the evaluation of aluminum for the prophylaxis of silicosis. This fcllcvs from the uncontrollable variables inherent in the industrial situation end other factors vhich have been discussed. For these reasons, it appears improbable that any research agency vould consider it advisable to under take such a project except under special conditions already discussed, and vhich may not be attainable. (5) The McIntyre Research Foundation, as presently organised, is not equipped to solve the aluminum prophylaxis problem in relation to silicosis. The steps considered necessary to accom plish this objective are outlined. (6) Research should be continued vith laboratory animals vith the -object of finding a more adequate basis for application to can. Such study is nov included in the program of the Saranac Laboratory of the Trudeau Foundation. - - Authors' Summary 866 Effects of Electricity on the Human Bod7. W.3. Kouveuhoven. Ind. Med. 18, 2o9 {July, 19^9). The author discusses briefly the various effects of electricity on the body, including variations vith the amount of current. The current values of interest are: (l) threshold of feeling, about 1 nillianpere; (2) let-go current, above vhich it is difficult to let go of a vine, about 9 milliamperes for men, 6 for vomen; (3) current producing ventri cular fibrillation, 0.1 ampere; (U) current producing a block in the ner vous system, one ampere or more; and (5) the counter shock current. The last three result in death if prolonged; cthervd.se artificial respiration may save the victim. These effects refer to alternating current of com mercial frequency. Direct current is much less harmful. The only effectof high-frequency currents is heating. / 867 Asbestos is and Cancer of the Lung. Editorial. J.A.M.A. 140, 1219-1220 (Aug. 13, 191*?). Records of English, American and German physicians and The Annual Report of the Chief Inspector of Factories in England for 19^7 shov that the occurrence of cancer of the lung is related to pulmonary asbestosis. This relation is supported by the folloving observations: (l) The incidence rate of cancer of the lungs in asbestosis patients .13 10 to 15 tines as high as among the general population. (2)- The male-female ratio is more nearly equal than it is for the general population, vhich indicates that an environmental and evidently occupational carcinogen tended to equalise the incidence rate of cancer of the lungs for both sexes. Recent experi mental observations support this interpretation of clinical evidence. 868 Chaves in the Lungs Produced by TTatural Graphite. H.S. Harding and G.3. Oliver. Srit. J. Ind. Med. 6, 91-99 (April, I9L9). A brief description is given of the industrial uses of natural graphite, vhich is a crystalline carbon nixed vith up to 10% of free silica and vith i other minerals. The greatest dust risk occurs in the grinding of natural graphite, for vhich evidence is presented to shov that thi3 can lead to f i 'I'.t u