We have had several thousand men under our care in this country for years without having had a single case of lead poisoning* This, I am sure, is because actual lead absorption has been reduced practically to the vanishing point in men engaged In this xtork, I am sure that this will be the case everywhere if tho work la done properly* Tou will note that the Initial symptoms of significant exposure to tetraethyl lead differ quite appreciably from the customary clinical picture of lead absorption* On the other hand, there is every reason to believe that prolonged slight exposure would result in the usual clinical manifestations of chronic lead poisoning* Accordingly wo make It a practice to examine every man carefully with reference to suggestive acute symptoms, as well as the blood and other clinical evidences of chronic lead absorption* Our studies on the lead excretion of men In this work have demonstrated that there occupational load absorption is insignificant if the conditions of their work are as they should be.

What is the comparative danger of inorganic lead in comparison with organic lead?

New formulas will have no requirement at all for Zinc Oxide -- leaded or lead free.

He is, however, still adhering strongly to his views that the "shadow" is caused by lead and he is now of the opinion that although there may not be lead in the "shadow" itself, lead through alteration of the bone structure is the reason for its appearance.

Pittsburgh, National Lead & !

NATIONAL LEAD COMPANY 111 Broadway.

444 PUBLIC HEALTH LAWS Section 6 compeh employer* to provide i monthly physical ex amination for each employee who b exposed to lead dust, bad fumes or lead solutions to ascertain the symptoms of lead prisoning.

The lead content of this atmosphere was less than 1*microgram per cubic meter.

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.

do not consider it a panacea for the Ind ustrial Lead problem.

of lead or .026 mg. of lead per 100 grams of blood.

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

National-Boston Lead' Co., -800 Albany Street Pittsburgh, National Lead & Oil Co. of Beane., 316 Fourth Arena PblJsdclpli John T.

N9804 h\ay 31, 197S Page. 1 I maid appAecievte hea/Ung youA corme.nt6 on what blood lead te.ve.l6 one "oh concernand what blood lead le.ve.l& ojie "dangeAouA."

NATIONAL LEAD COMPANY--lit nrnory.