AHQ SUBSIDIARY CO^AH ILL QTAIL Cf CHAfCLS IN QLPRLCUTIOH RicKV - QCEUBR HEOITS TO RESERVE ;c e t a l Pr o o u c in c Co mp a n ie s : h c o r o a Co b b e r Pr o d u c t io r o f Min in s Co u p a r y - Co b b e r - Zin c l RT E RNAT 10 MAi. 5WELTI NC ANO NCFIHIRC COUBARV DWELT I NO De p ar t men t : 700CCE Pc ART Pr o d u c t io n o f * Co p p e r - Le ad Ra n c h Bu ic o ir o i, e t c . bULPHioe Co n c en t r a t o r Ma t e r ia l t r e a t e d Mia mi Pc a r t Zir c Ox id e De p a r t me n t i p r o o u c t io r o p Zin c Ox id e Ea s t Ch ic a g o Pc a n t Ak r o n Pl a n t MCFIWINC OCBARTWCNTt Ea s t ^mic a c o Pl a n t Ma t c h ia c c h a r c c d Ra r it a n Co p p e r *o r k s RCFINIHC PROOUCTION ' Ca t h o o c s Sic c c t s SECONDARY PRODUCTION Ca t mo o c s Ec e c t r o Sh e e t De p a r t me n t Ah it e Le a d De p a r t me n t !

vsrm>\T*o ITT '-w i t - t f o mo n t h s s t t t o ttrg n>4 DIP^CTOPS* MCTIWB * U-vRCH 17TH 1934 '4L.S: ' 'r"oYi of '`hita Ld raiaa of ~hito Load U "11 salat of ?

VHENIUL Review Vol. 89.

August 25, 1932 Dr 2.

June 2, 1937 Dr* JV Howard Beard Health Service station TJrbana, Illinois Dear Doctor Beards 1 hasten to reply to your letter of May 28th concerning the experimental administration of lead and arsenic residues to human subjects* I am quite sympathetic with this type of experimentation since I think it is virtually the only satisfactory means of answering some of the questions associated with the spray residue prefolem* On the other hand I can best tell you whether ornot I consider the experimental program safe by describing to you what I would feel to be necessary safeguards in carrying out such work* I would not wish to do this type of experimentation and., as a matter of fact, I would not do it under any circumstances unless r had the facilities, both clinical and analytical, to follow carefully the subjects and to know precisely what was happening in the matter of lead absorption and lead excretion* `To be precise, experimental subjects under this regime should be given a physical examination not less than once a week, including a rather careful and thorough-going study of the blood* In addition their fecal and urinary excretion should be followed in such a way as to enable one to be sure that they were main taining a balance between intake and output* The results here are In some degree predictable from the available Information, but I do not believe one could escape a very just criticism for being incautious if he did not maintain such a degree of control In this type of experimental work.

March 7, 1932 Mr.

YOUNG MEN'S CHRISTIAN ASSOCIATION CENTRAL PARKWAY BRANCH Elm and Central Parkway CINCINNATI, O.

October lif-s1936 Dr.

THE ASSOCIATED ETHYL COMPANY LIMITED THE ADELPHI, LONDON, W.C.2 CM Mes: ETHYLPORT, LONDON egmms: e t h y l p o r t . r a n d ,Lo n d o n %lepL'tone: TEMPLE BAR 9831 directors: J.W.

INTER-OFFICE ORflESPONDCNCE Et h y l Ga s o l in e Co r p o r a t io n Re s e a e c h La b o r a t o r ie s 723 Ea s t Mil w a u k e e Av e n u b De t r o it , Mic h ig a n September 12, 1938* Dr, fill lard F, Machie College of Medicine University of Cincinnati Cincinnati, Ohio Dear Bill: I am sending you herewith a copy of our report LTD $38-46 covering the steam distillation of some of your sludges, I will be interested to bear from you how our results compare with yours on these same samples.

August 11, 1932 Mr.

March 11, 1931 Dr.

\1 .)

DIRECTORS - LEAD INDUSTRIES ASSOCIATION 1937 B.

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