Document O3NEdjRpMzbXnzJ53xJD2BD3e

FED ERAL SECURI TY A GEN CY Public Health Service N ATI ON AL INSTITUTES OF HEALTH Bethesda 14, Md. EX PERIM EN TA L BIO LO G Y AN D M ED ICIN E IN STITU TE M ICRO BIO LO GICA L IN STITU TE N A TIO N A L CA N CER IN STITU TE N A TIO N A L H EA RT IN STITU TE N A TIO N A L IN STITU TE O F D EN TA L RESEA RCH N A TIO N A L IN STITU TE O F M EN TA L H EA LTH T H E C LIN IC A L CEN TERl D IV ISIO N O F RESEA RCH GRA N TS A N D FELLO W SH IPS . * . . JllIlS O j 19 5 0 Dr. Robert A. Kehoe The Kettering Laboratory University of Cincinnati Cincinnati, Ohio Dear Bob: ' ' Thanh you so very much for your comments on ny replies to tho cuestions on lead arsenate. I have rewritten ny replies leaving out the parts you ques tioned. Paul.A. Neal, M. D. Chief, Laboratory of Physical Biology Experimental Biology and Medicine Institute 0002055 June 1, 1950 Dp . Paul A. Neal, Chief, Laboratory of Physical Biology, Experimental Biology and Medicine Institute, Public Health Service, Bethesda lty, Maryland. ! . Dear Paul * I have examined your reply to questions on lead arsenate, and have made a fey marginal comments* These are of some consequence scientifically, but they have no relevance to the issue which was under conlderation. I think there are other questions that could have been raised, but they were not, and It is just as well that they were not, since a number of them could hardly be answered adequately, in either the scientific or practical sense. I hope thl s covers the situation of lead and arsenic and that the tolerences will be allowed to go unchallenged. As you are probably aware the use of lead arsenate has fallen off greatly. I am told that its se in the pacific northwest Is almost negligible. W e have returned to our study of human subjects exposed to known quantities of lead, - this time, in finely divided form in the I am satisfied wi t h what we know about the fate of Ingested lead, or perhaps I should say that I see no very great justification for extending our observations on persons given known quantities of soluble lead daily over long periods of t i m e . The inhalation problem has been on my mind for a long time, and while It will take a long time to study it, we have made a beginning after being rudely interrupted by the war and later retarded by certain other difficulties. It was gook to see you in Washington. I regret that we do not see each other more often, and then only for a brief time. With best regards, Sincerely yours, RAK ef . sEnc. 'Robert . ifehoe, l4. D. ^ V ^ ,:i` FEDERAL SECURITY AGEN CY . Public Health Service N A T I O N A L I N STI TUTES OF H EALTH Bethesda 14, Md. EX PERIM EN TA L BIO LO GY AN D M ED ICIN E IN STITU TE M ICRO BIO LO GICA L IN STITU TE N A TIO N A L CA N CER IN STITU TE N A TIO N A L H EA RT IN STITU TE N A TIO N A L IN STITU TE! O F D EN TA L RESEA RCH N A TIO N A L IN STITU TE! O F M EN TA L H EA LTH T H E C LIN IC A L CEN TER D IV ISIO N O F RESEA RCH GRA N TS AN D FELLO W SH IPS May 3, 1950 Dr. Robert Kehoe Kettering Laboratory of Applied Physiology University of Cincinnati Cincinnati 19, Ohio . Dear Bob: I aa attaching a copy of my reply to a number of questions on lead arsenate, i.e. its toxicity and potential dangers as a spray residue on certain fruits. I would appreciate it very much if you would glance over this material and give me the advantage of your criticisms. It was very pleasant to see you in 'Washington dur ing the air pollutants' conference. Kindest regards, Paul A. Neal, M. D. Chief, Laboratory of Physical Biology Experimental Biology and Medicine Institute Attachment