': i- I?.

February 6, 1930- Dr.

V Gr aham:Edg ar .

.a l p h b o w e n , b . a .

De pa r t me n t of H o r t ic u l t u r e i UNIVERSITY1'of ILLINOIS COLLEGE of AGRICULTURE AGRICULTURAL EXPERIMENT STATION URBAN A, I LLI N O I S January 2^, 1936 Dr.

Docteur F lo ren t Coste P ro fe sseu r Agrg la F a c u lt de Mdecine Mdecin des H pitaux de P a ris 41, rue C ardinet \ P a ris , December 24th,1936 Dr HA* Mehoe U niversity of C incinnati C ollege of M edicine C in c in n a ti, Ohio, U.S.A.

* .V s a f e t y COM M ITTEE O.B.

August 7, 1937 Hr. 0* B* Lewis Ethyl Gasoline Corporation Chrysler Building Rea York City lies York '.

The tubjrot of *noraal load* has boon ein tensively investigated by Kehoe and hi a associates (1333*1933) Jour, of Xnd* Hyg.1933 - A rticl* ready for publication 1939 - Citation to bo providsd later* probably in Jour* Biol, Chao* -who have found that the normal American adult excretes lead at the rate of 0.25 to 0,^0 nm^u per day* Host of thia lead le present In the feces* the urinary output amounting only to 0-02 to 0,10 aga, per day* (0,02 to D.OS ags, per liter).

Caracas: November 24, 1939 Dr.

\ COP Y TREASURY DEPARTIRENT Public Health Service WASHINGTON August 7, 1934 Mr.

7-19-77 The Physiological Tolerance of Apparently Healthy Human Individuals for the Daily Absorption of Inorganic Lead Salts Over Extended Periods of Time Introduction ( It has been known for centuries that the absorption of inorganic compounds of lead, in sufficient quantities, under appropriate circumstances, and over considerable periods of time, are capable of inducing poisonous effects upon man.

March 31, 1930 Mr.

INTERrOFFICE CORRESPONDENCE Copy: Dr* Graham-EdgarDr.

'1 \ :-i : ' ' . !