It is known that some substances in our environment, for example, 2-naphthylamine and tetraethyl lead are converted to carcinogenic compounds.

Personally, I can see no reason why very rvall samples of tetraethyl lead should not be sent to others engaged in research work at your own discretion.

For your work the kerosene for the inhibitor as well as the methanol-water and tetraethyl lead is probably available to you locally.

One effect of the last paragraph of this published memo randum of October 24th. is that the Division Commander here has had large sign in red letters made to put up wherever gasoline containing tetraethyl lead reading; "DA1IGER-LEAD* N29491 2 over - if I am correct in my deductions, and if I am not correct, then I should like to know what steps are neceassry to take to safe guard our personnel who daily come in contact with gasoline containing tetraethyl lead.

The toxicologic information on these compounds with the exception of tetraethyl lead, has not been published.

As a matter of fact, 1 am entirely certain from our enormous body of data that it is quite impossible for individuals to absorb significant quantities of lead as the result of their contact with gasoline containing the commercial concentrations of tetraethyl lead.

X make this suggestion for t he reason that we have carefully investigated cases of all kinds that have arisen under conditions in which exposure to tetraethyl lead has been suspected.

April 25, 1935 Mr* Georges Thenault Boon 5^7 25 Avenue VIctor-Emmanuel III Paris Prance , Dear Mr* Thenault: I have not heard from you for eorae time and I toko it that no news from you is probably good news in that it indicates that you are not having any very serious difficulties which concern me* The chief purpose of this letter is to call your attention to an ' article which was recently published "On Intoxication by Tetraethyl Lead" by M* Duvolr and F* Cost, the latter as you probably know being our associate and colleague.

The toxicologic information on these compounds with the exception of tetraethyl lead, has not been published.

As a matter of fact, 1 am entirely certain from our enormous body of data that it is quite impossible for individuals to absorb significant quantities of lead as the result of their contact with gasoline containing the commercial concentrations of tetraethyl lead.

As a matter of fact, 1 am entirely certain from our enormous body of data that it is quite Impossible for individuals to absorb significant quantities of lead as the result of their contact with gasoline containing the commercial concentrations of tetraethyl lead.

As indicated above, our object is to inform, in the hope that on the evidence produced Government Departments will be satisfied that present regulations (if any) and recommended practices covering the use of tetraethyl lead will prove satisfactoi'y in connection with the use of tetramethyl lead and that therefore, providing these requirements are met no further action is necessary by the Oil Industry.

I have a suspicion that bs is fooling around with either a lead plant or tetraethyl lead in some fashion, as this level of excretion indicates recent severe exposure.

I believe the simplest modification of the sign to make it both correct and adaptable, would be to use the designation "Lead Alkyl" where the sign now uses the words "Lead Tetraethyl."

One point that should be mentioned is that in these plants the exposure ie limited entirely to tetraethyl lead and inorganic lead compounds, whereas, in those oases that have arisen from the cleaning of tanks, as you will find mentioned in the reprint sent you, there; is also a possible exposure to ethylene di bromide which you say know is u3d as a oarrying agent for tetraethyl lead in gasoline.