In addition to this, DYTHAL has a total lead content equivalent to 81.9% PbO and its available basic lead content is 54.6%.

My supply of reprints of this article Is exhausted* We have other clinical data on tetraethyl lead poisoning which has not been published bub which I hope to get into print some time in the near future* The article on "The Behavior of Lead in the Animal Organism II Tetraethyl Lead", and the series of articles "On the Normal Absorption and Excretion of Lead" are among the last of my copies.

June 17, *935 Dr* John D* Ellis 122 South Michigan Avenue Chicago, Illinois Dear Dr* Ellis: In reply to your letter of June 12th concerning a speotrographic analysis of a specimen of spinal fluid, I should like to point out two things* First, a sample of spinal fluid for spectrgraphic analysis is very likely to be contaminated with lead in the process of collection, unless a specially made lead-free spinal puncture needle is used in withdrawing the fluid* The huh of the usual spinal fluid needle contains significant amounts of lead and Is likely to cause misleading analytical findings* Second, the available data on the lead content of spinal fluid is rather meager with relation to lead absorption, so that a diagnosis op the basis of such evidence is considerably less conclusive than it would he if based upon analyses of blood, arid more particularly, urine.

; Coffeyville ) National Lead Co.)

I still doubt the statement that the fumes contain lead compounds.

Our studios on the lead excretion of men In this work have demonstrated that there occupational lead absorption is insignificant if the conditions of their work are as they should be.

Judge Metz then asked for an opinion on the possibility of the complaintant having absorbed lead from leaded gasoline and on the possibility of an optic neuritis resulting from the stated exposure to leaded gasoline.

Judge Metz then asked for an opinion on the possibility of the complaintant having absorbed lead from leaded gasoline and on the possibility of an optic neuritis resulting from the stated exposure to leaded gasoline.

Bos) N/A Brazing Cable Bocor ends Seal leads .

In both instances, however, we have had facilities for the determination of the magnitude of the lead exposure In very precise terms, as determined by the study of the lead content of the excreta, blood or tissues.

Pittsburgh, National Lead & Oil Co. of Pa., j i6 Fourth Ave.

Over a goodly number of years I have been deeply interested in bringing about more effective control of lead exposure, both In the community at large, but more particularly in the lead trades.

I am pleased to comply with your request to send reprints of some of the publications of the Laboratory on lead and the prevention of lead poisoning.

The experience of thousands.of users;..of property owners and good The Carter brand V n~~ white-lead le olao'^eold by National Lead Company.

The porphyrin test does not indicate high lead exposure as soon as urinary lead determinations, and both tests should be used whenever possible.