Lewie*' Attached hereto is exchange of corraapondenoe vrlth Lei"TM*Doen of DowChemical in connection with the use of Ot hundred pounds of tetraethyl lead which we recently sent them.

Kehoes paper on tetraethyl lead poisoning.

RespLratory system (pulmonary edema); by Inhalation of vapors "Semeaan" mercurial seed disinfectants Systemic and 3kin (vesicant); by contact or inhalation of dust DUP 0901193 Sulfur dioxide Respiratory system (hazardous to asthmatics); by inhalation "Teflon", combustion products Respiratory system (pulmonary edema) by inhalation of fumes or amokc (welding hazard) Tetraethyl lead Syotcmic; by skin contact or o inhalation of vapors Ci jo h Mg. of particulate material per cubic meter of air Threshold Limit Value (l^uG)____ 5 ppm 3* 0.5 mg/to 5 ppm 0.1 mz/iY 0.1 ppm 5 ppm 0.075 ng/to'

I ronder if you would be kind enough to write then n letter, perhaps telling them in a general way what the effects of tetraethyl lead tire when added to lubricating oil.

\ 'T We have already received the two smaxi cansv of tetraethyl lead and have proceeded with our experi ments.

It is known that . . . 2-naphthylamine and tetraethyl lead are converted to carcinogenic compounds."

I have just received a letter from Join in which he states that the present tetraethyl lead by gravimetric analysis ran as high as 25^ {Z2% fluid).

Kehoe: Thank you for your letter of June 15, enclosing the draft of "Changes in the Regulations for the Sale and Distribution of Gasoline Containing Tetraethyl Lead".

Lewis: I dare say the reason you do not have in your files corres pondence on the subject of the ordering of Ethyl Fluid and tetraethyl lead outside of laboratories, is that this was apparently a three-ring session between Kaley, Calingaert and, myself.

Tetraethyl Lead Poisoning. 1925

Kehoe*s paper on tetraethyl lead poisoning.

Coheir; I have received a letter from Sergeant Cohen, asking for infor mation about tetraethyl lead, and I have sent him all of the infoiraation ve have.

Kehoe: Thank you for your letter of June 15, enclosing the draft of "Changes in the Regulations for the Sale and Distribution of Gasoline Containing Tetraethyl Lead".

He offers to make available any information that the Ethyl Corporation has that would be useful to me in connection with the Surgeon General's Committee that has been appointed to consider possible increase in the permissive amounts of lead tetraethyl in gasoline.

December 12, 19^9 - Completion of Sixth Tetraethyl Lead Building.