Document mmZjkzn2VmkRKEYykQxeDJk3Z

ltaroh 27, 1924. RR3/ajZ> Memorandum for Aset* Surg. (Jen. A. M. Stinson. /v 7 ' " . The Bureau of Mines began the study of the effoots of tetra ethyl lead soma months ago (November 6, 1923}* r>/!Thls studyiebsing made to determine the extent of the health hazard, If any, due to the use of this ohemical in automobile and other internal-,oo'nbustion engines (Juinea pigs, rabbits, dogs, pigeons, and monkeys are exposed to exhaust gas from a gasoline engine...in two groups,one exposure .lasting.3 hours and another 6 hours. 'These exposures are made daily with the excep tion of Sunday and will be carried out oyer a period of months. .. * No conclusions oan be drawn at the present time, but we. have found no pathological effoots on animals examined up to the pres ent. This, of-course, is not conolueiye. ... . * I would.suggest;that, until, definite, infownation,.|s obtained, no publicity be given to the study and no results be given out. I am inclosing copy of the report of the last conference held on this subject at Pittsburgh. The above is in oojafismation of my. talk with you over the phone on this date. Inolosure No. 2359. R. R. SAYERS Surgeon, 1J.S.P.H.S. Chief Surgeon, U.S.B.of M.