Schradin took a particularly long time in examining each of these men so that he could have the opportunity of talking to them and explaining everything in detail as well as calm any fears that might exist regarding any lead poisoning or any lead haaardg.

The only means we have of determining the probable quantities of lead in the intact human body'and their significance for hygienic or diagnostic purpose, is that of obtaining appropriate samples of blood and urine without Inducing any change of any kind in the pattern of distribution of the lead in the body.

ViC* Pr*j;0*nf lead industries Association, inc. / Zinc Institute.

As I have indicated previously, the published material does not cover the scope or the productivity of the work done; and I am working toward a prolonged period of study and writing which will enable me to prepare a monograph on lead (occurrence in nature, metabolism in man^ in health and disease, clinical lead poisoning, diagnoses and therapy, industrial hygiene in the lead trades, lead in the general environment of man as a problem of public health, supplementary information as to certain physiological indices based on daily observation of industrial employees.and experimental subjects).

We believe thst such efforts should stimulate the market for sheet lead and other lead products

With the dithisone method one may use small samples of urine and obtain quite accurate results* X do not know how much experience you have had with the various methods* but I think it is perhaps worth while to caution you against the use of methods which have not been very carefully checked against small known quantities of lead* I say this only because quite a large number of mis-leading results hove been published from laboratories In this country In which not too critically tested methods have been employed* Moreover the diagnostic interpretation which has been put on many of the results has often been unjustified* I think you will find a fairly adequate discussion of most of our problems in relation to tetraethyl lead and leaded gasolines In the book which I have sent you* I find that the most frequent cause of misunderstanding Is in relation to the handling of gasoline.

s^.r, -- periodic blood and urine lead determinations on all workers . *'* ` - ,'; '.i'j'l; exoosed to -.lead,.'*' The' frequency with which these tests ''4j <-4 `iM*V' * " should be performed will- vary according to the degree 'of lead exposure in any one work situation and on the clinical "',/- \ appraisal of.

THIS BROWN TOP TUBE IS LEAD FREE.

(Pig Lead Sales) 2.

Louis Lead 4 Oil Works, St.

Iced, sad ccrtaia apt- carbesata aad lead cbletida a4ltb b chi aSoyt.

In each ea*e of lead poisoning, George X.

LEAD PIPE SIZES Lead Industries Association Standard Size Inside Diameter Classification East west 3/8 in.

By this means the workers are divided into 3 groups--those in Stage I are "lead carriers", in Stage 11 lead dyscrasias, and Stage 111 lead toxicoses.

The pigment is * blend of ffbite Lead, Leaded Zinc and ^Itanium Oxide.