(2) Other lead deposits. - In the flame valve jet, about 10 or 20 mg. lead is deposited every 4 hrs., and this Is sufficient to require cleaning the valve about every 12 hrs.

.used, 66$ of the lead recovered; Run 4, 15 hrs., 4 filters used, 77$ of the lead recovered; Run 5, analysis in progress.

That is why I am less happy when you say (page 5) that a reduction in haemoglobin due to lead is lead poisoning.

Metallic lead or lead compounds which are distributed within the environment of small children are a potential source of hazaxd.

*j.er dry white lead or white lead ground in oil in paste or liquid i3 order that the sane may be carried into or sold within such for lufitry aa a Product within the protection of the patent granted by of country, then Anaconda may in its discretion and with

In operating a lead bath at this temperature of course lead is partially volatile and the lead fumes must be taken care of. 7/e have done this by covering the hood which maintains the reducing gas over the lead bath with another hood connected to an exhaust fan to carry the lead fumes out of the building. 7/e have taken the matter up from the standpoint of lead toxicity with Dr.

ANEXPERIMENTAL STUDY OP LEAD ABSORPTION The normal Intake and output of lead Lead intake and output under conditions of experimentally induced lead exposure Immediate response to increased intake Relation to industrial lead exposure Eventual response to increased intake Threshold of Intoxication not reached. < AInbtnooxrmicaaltiaobns.orption and excretion without Correspondence of blood and urinary levels to those seen In occupational lead exposure Comparison with results at H.R. plant.

In the matter of your statement as regards tetra ethyl lead poisoning, my objection was not that reference was made to tetraethyl lead which produces a type of poisoning In large doses more serious perhaps than any other lead compound* The misleading portion of the statement consisted of the fact that reference was made to the seriousness of the poisoning asso ciated with anti-knock gasoline containing tetraethyl lead, Y/hereas all of the evidence indicates that lead poisoning from this;1 type of distribution of tetraethyl lead is non-existent.

For metal surfaces another lead paint '--Dutch Boy red-lead--provides com plete protection against corrosion.

NATIONAL LEAD COMPANY New York.

Robert A Kehoe University of Cincinnati College of Medicine Cincinnati Ohio* My dear Kehoe* I am sorry to have been delayed in acknowledging your second lead paper but I took a holiday over the 4th of July -which has delayed me somewhat* Before I attempt to make any detailed comment on your conclusions* I would like to have you clarify one or two points in my mind as some of the data and some of the conclusions seem to me inconsistent with the results in the papers on Normal Lead and the first paper on Tetraethyl Lead* As I understand it, you interpret in general lead in the faces as a measure of exposure and lead in the urine as a measure of absorption* Presumably then, when exposure is changed there should be a change in the fecal lead perhaps followed by a change in the urinary lead* I am a little handicapped in your paper by the ab* senoe of the figures but there is apparently no evidence in the case of the two garage workers, A M* and W* B, of a change in either fecal or urinary lead when removed from their occupation Furthermore, the urinary lead seems to be well within the limits of normal lead given in your previous papers with the exception of -fee four medical students who were in this investigation.

Presumably then* when exposure is changed there should be a change in the fecal lead perhaps followed by a change in the urinary lead.

Stetavalnatloa f lead aoapaaada prsn.t Result Far Gat Load as Lead Tat r aat iiyl Par Cent L*a<S a t r i o n f i Lead For Cant Lead a D iat byl Lead Sal i d Per Cent Load as LJ> avai rriafc&yl Lead Halid and Carbonat Per C*mt Lead a t aor gaal Lead < 0, 00001 0,0005 0 ,0 0 17 0,00045 0. 225 ftaportad- 5* 24"">MI.- K 00096S1

Responsible for this vastly im proved flat paint is Dutch' Boy; Lead Mixing Oil... a companion;1 product to Dutch BoyWhite-Lead., When added to Dutch , Boy;; White-Lead, it proditceis a finish!

The samples for lead were all collected at operations in which lead was part of the basic compound.