Neumann - NA HIGHLIGHTS Lead price increases to 26C.

I have had no direct experience with lead azide.

Elements of Industrial Toxicology tivity were observed Gasoline vanes in composition, but is commonly a petroleum fraction containing hexanes, heptanes, and octanes with varying amounts of unsaturated, cyclic, and aromatic compounds A cracked gasoline may con tain 50 per cent or more compounds other than the saturated aliphatic hvdrocarhons If the gasoline consists of saturated and unsaturated aliphatic compounds and cyclic compounds it will be a narcotic and an ir ritant to the mucous membranes The main toxic action will be depression of the central nervous svstem with symptoms of giddiness, dizziness, hilarity, and headache not unlike an alcoholic intoxication Mild symptoms of this sort are apt to be produced by relatively short exposures to concentrations of 500 to 750 ppm of this kind of gasoline In addi tion, mild blood changes, neuritis, and neu rasthenias have been reported If the gasoline is made from a crude oil containing 40 per cent or more of aromatics or is enriched in aromatics by the refining process, the toxicity mav be substantially higher The tetraethyl lead content of gasoline is low enough to make any lead exposures from ordinary handling and dispensing of gasoline in garages and filling stations negligible Tetraethyl lead can however present a toxic hazard by inhalation and absorption through the skin when entry is made into tanks and other confined spaces that have contained leaded gasoline See Lead and Hygienic Guide Germanium, one of the less common metals which have some industrial uses, is employed particularly in the electronics industry for diodes and transistors It appears to be a relatively inert metal and has not been re ported as the cause of any occupational dis eases in man In animal experiments, the LD50 for rats bv intraperitonea!

The study would proceed approxtsatsly os folic** t 7 Phase ^ Li si` eg and analysis of all present uses for lead and lead alleyi based on AJX Information, Estimate of smt ket for each use in existing installation*.

The frames were painted with the same three paints mentioned above plus a white lead-in-oil paint.

Tetraethyl lead can however pre sent a tone hazard by inhalation and ab solution through tiie skin when entry is made into tanks and other confined spaces that have contained leaded gasoline.

G Gasoline vanes in composition, but is com monly a petroleum fraction containing hex anes, heptanes, and octanes with varying amounts of unsaturated, cyclic, and aromatic compounds A cracked gasoline may contain 50 percent or more compounds other than the saturated aliphatic hydrocarbons If the gasoline consists of saturated and un saturated aliphatic compounds and cyclic com pounds, it will be a narcotic and an irritant to the mucous membranes The mam toxic action will be depression of the central nerv ous system with symptoms of giddiness, dizzi ness, hilarity, and headache not unlike an alco holic intoxication Mild symptoms of this sort are apt to be produced by relabvely short ex posures to concentrations of 500 to 750 ppm of this land of gasoline In addition, mild blood changes, neuritis, and neurasthenias have been reported If the gasoline is made from a crude oil containing 40 percent or more of aromatics or is ennched in aromatics by the refining proc ess, the toxicity may be substantially higher The tetraethyl lead content of gasoline is low enough to make any lead exposures from ordinary handling and dispensing of gasoline m garages and filling stations negligible Tetraethyl lead can, however, present a toxic hazard by inhalation and absorption through the skm when entry is made mto tanks and other confined spaces that have contained leaded gasoline See Lead.

We will have enough lead to carry us thru the end of the year.

Professor Dr* G, Herman Sieveking Rothenbaumchausaee Hr* 211 Hamburg 13 Germany Dear Doctor Sievokingj It was a pleasure to hear from you some time ago and I have been somewhat tardy in replying by reason of the press of many things de manding my attention* I seem to be in a rush even when I am traveling outside this country* and X am sorry that I have never had the opportunity to talk with you about the many aspects of our mutual problems* I am very much interested in the work which you mentioned on methods of determining the lead content of urine* and I should be very glad to hear of your results* vie shall maintain as close contact as we can with Dr* Helntzman in Leuna who 13 also woiicing on lead methods* We shall both check back and forth on cergain samples so as to determine the comparability of our methods* I believe you will find that some modification of the Fischer Leopoldl Hdithis one" method will be found to be most suitable for the analysis of urine* unless one has spectrograph 1c equipment available* With the dithizone method one may use small samples of urine and obtain quite accurate results* I do not know how much experience you have had with the various methods* but I think it is perhaps worth while to caution you against the use of methods which have not been very carefully checked against small known quantities of lead* X say this only because quite a large number of mispleading results heve been published from laboratories in this country in which not too critically tested methods hay been employed* Moreover the diagnostic interpretation which has been put on many of the results has often been unjustified* I think you will find a fairly adequate discussion of most of our problems in relation to tetraethyl lead and leaded gasolines in the book which I have sent you* I find that the moat frequent cause of misunderstanding is in relation to the handling of gasoline* After fairly large experience and rather critical observa tions# we have come to the conclusion that there are no HE 0013525 which the gasoline has been stored for considerable periods of tine.

On the other hand, If their expo intermittent, or if the jobs performed vary considerabl severity, lead poisoning Is ^are in i ts occurrence.

(1) Hark ia aadarvpy ta attaapt ta rameh a Of 'added lead* level by tkla data

v f-\h V*-Y' H Z GG; J 4 5 dangers associated with the handling of Fluid with the purely hypothetical dangers arising from the handling of gasoline containing small quantities of tetraethyl lead* Certain articles* which I am sending you* deal with the problem of leaded gasoline.

WEBB Concerning a Tetraethyl Lead Manufacturing Riant in Germany if".;- ' \ Purely commercial considerations make it imperative that there should he no recurrence of episodes of lead poisoning in the manufacturing end of the industry.

2i IHft A N13829 To the Stockholders of Motional Lead Company: The following is a Consolidated Balance Sheet of National Lead Company as of June 80, 1941 and a Statement of Consolidated Income and Surplus for the first six months of 1941.

DANGERS OF WHITE LEAD.