Lead Poisoning Lead poisoning is the most insidious and most common of all industrial diseases.

Microscopic blood changes are not specific but may arise from a variety of other conditions of the blood* You are also right in suggesting that the danger of lead absorption is quite considerable among men who work in quarters in which unventllated containers of molten solder are used* Considerable quantities of vaporized lead, which is promptly oxidized, are given off frpm molten solder pots* It is standard practice to carry thepo vapors away by means of a well ventilated hood over these pots* Large-scale solder operations provide con siderable opportunity for lead exposure and one finds In practice that carefully designed and operated ventilating equ'pment is necessary to prevent lead po'soning among men engaged in such work* I do not think tt Is wise for us to intrude Into other plant activities of distributing companies except in so far as their lead hazards may give rise to confusion as to the sources of the lead exposure of men who aife also engaged in handling leaded gasoline# or mixing Ethyl Fluid* It is for this reason that I have taken care to say Sin my instructions to our phystclans# that they should ho careful to exclude from our type of work men who are engaged in other types of lead exposure* Obviously where the opportunity presents Itself to advance the cause of industrial hygiene# I should expect our medical consultants to take such action as may not get them into difficulties in relation to their specific responsibilities to us# Only to this extent no I think Or* Coke might be Justified In looking Into this matter* I have cabled you concerning the appointment of a physician In Saopaulo# and having received your reply# I assume the matter is at a dead end for the moment* I think your Investigations# as reported in your letters of Agril 21st and 26th* are Quit in line with my own point of view as to proper procedure* I recognize fully that you may receive bad information and# therefor# you may be unsuccessful in your choice of a physician* However I think you proceed along the line which we discussed when sue la3t talked hver this matter# end I believe this means gives you the best opportunity for success# Very truly yours# HAKjis co &r* Ctaamplin ____ ______ i kohert A* Eohoe# r'.B

Lead Poisoning Lead poisoning is the most insidious and most common of all industrial diseases.

The 0.1 mg. heavy metals (expressed as lead) re covered from urine at the present time is largely lead with a trace of silver.

Amounts of organic lead recovered from the effluent were insignificant and sampling for organic lead in the flue gas was discontinued after the second run.

I * therefore* began feed in g experimental subjects d e fin ite q u a n tities of lead w hile fo llo w in g c a r e fu lly t h e ir t o t a l lead in tak e and t h e ir t o t a l lead o u tp u t.

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.

National Lead Co.

First... the patented electrolytic cells used in the process refine the metallic lead as they convert it into white lead . . . thus excluding the impurities found in ordinary white leads.

;p .forward in Boy Ij4ad|Mradg its companion Whitt-Lead, 1 character- a^hite^lead 'flkft'pjtis duU*% NATIONAL LEAD COMPANY 111 Sroadway, New York} llGOakSc., BaSalo; 9DtfJjW:. 18th St..

National Lead Co.

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

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.

NATIONAL LEAD COMPANY 111 Broadway.

Kozelka's findings of" .145 mg. of lead in blood were all out of proportion to his normal finding of .05-mg. of lead in 1650 cc. of urine.