Our Lead Chemicals Department continues its profitable operations, due in a large measure to the increase in demand for Lead Chem icals to such an extent that the manufacture of Dry Colors is now being terminated.

For example, the lead in "wheat, beef, pork and potatoes," and that on cows and milk, as well as the remark concerning the lead in the skeletons of the ancient Incas ..."

, We have seen lead in the blood In various types of plumbism In ooneentratlons extending from slightly in excess of a milligram per 100 grams of blood down to one tenth of a milligram per 100 grama d b blood* In general* two factors appear to determine the- if height of the lead concentration} one* the severity of exposure} and two* the time Interval between the oessatlon n ,, , ,, u4 4o / the severity of the symptoms correlate with the height of the lead concentration, hut this Is not aIsays true* 1 think It Is quite safe to say that the presence of one tenth of a milligram of lead per 100 grams of blood la Indicative of a recent significant exposure to lead* and although symptoms may not be present at this concentration, the existence of symptoms resembling those of plumblsm may be adequately explained* I should be inclined* at present* to regard values under one tenth of a milligram of blood as slgnlfloant only If repeated observations confirm this as the basic level of lead concentration rather than a chance high value, The lead values in the spinal fluid are much lower.

We have not found evidence of the absorption of lead out of Ethyl Gasoline in any concentration of tetraethyl lead in gaso line less than 1 part in 100.0.

The general exposure of our people to lead is variable from day to day, as well as seasonally, dependent mainly upon the content of lead in the food and beverages consumed from day to day; it is also variable because of the variability of the human appetite and demand for food, in that the individual may consume large or small quantities habitually, or he' may choose to eat articles that tend generally to be either high or low in lead

As a writer on lead poisoning, and director of the lead metabolism studies in the Kettering Laboratory, outstandingjbn the satum- inejinjfetal, I tufo to you for hoped for and kind help}!

The tank which wpa cleaned, and from which this sludge sample was derived, was the only one at this site which had been used for tile direct mixing, of leaded gasoline.

do 1,400.00 (U. 3. currency,), by The nobertson Lead Mfg.

The prtpmii'`r.s :u wljidi tlie necessary metvts. oxide >f zinc, carbonate o- lead and ` sulphate of lead, are c.

Joseph Lead Co.

APCA Absts. 361 Environmental Factors in Childhood Lead Poisoning.

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

#l by one Institution Mitch 1* exper* teheed In lead research in both eeroaelrl?

Stopper #1 -- J .8 grams = 0.06 mg. lead Stopper #2 -- 3*9 grams = 0.075 mg. lead B.

For example, the lead in "wheat, beef, pork and potatoes," and that on cows and milk, as well as the remark concerning the lead in the skeletons of the ancient Incas ..."