Kehoe: .Is yen probably know, the addition of tetraethyl-- lead is regul ated by law in Venezuela.

The use of a dithizone extraction is obviously an improvement, and this method is satisfactory when there is sufficient lead to be extracted; that is, when the concen tration of lead in the solution to be polarized is at least of the order of magnitude of 1 microgram of lead per ml* This means, we believe, that large aliquots muiit be extracted, and that when small samples are to be used, the lead must be concentrated in some form.

Personal direction of lead studies, A, Problems under study or scheduled for study. 1, Toxicity studies - new lead compounds in gasoline 2, aSntuddypuobflicphhyesaioltlhogaiscpaelcbtsasoisf loefadleeaddghaaszoalirndes, in general (a).

But here's a made By combining Boy White-Lead and its . panion product Dutchlij Bor Lead Mixing Oil---which lias all the advantages you.

It would be impossible to Interpret this result vvLthout knowing the history of the lead exposure of this man and especially the last day on which he worked, assum- Ing his work: involved exposure to lead compounds.

Dear Sir: I f you have read the Dutch Boy white-lead adver tising which has been running in the newspapers you Please consider this letter as a personal invitation to call on us at any time.

- White-Lead _J|gives the interior jerf the Hotel Pierre the rich, %^xtistic finish its designers, desired.

NATIONAL LEAD COMPANY r.

She was immediately interested in as much an we have been making a systematic study of the lead content of vegetation and other food material in this country and in various other countries* Some portion of this lead which is regularly found in vegetation is derived from the soil* Therefore we have become very much interested in the lead content of soils frees different parts of the earth* Hearing of your collection of soils.

To Members of the Lead Industries Associations 8OBJECTi APPor.TVr?

Providing it is decided that the leaded gasoline is hazard ous, we probably shall have t o purchase two grades, regular branded and US motor minus lead Ye should like to have you pay particular attention to our questions relative to carbon monoxide and lead as w e believe your remarks should be valuable Can you give us the full details quickly ?

The amount of lead in the blood is slightly increased.

Jones* opinion that you were sending in an order for a small quantity of tetraethyl lead with which to make pre liminary observations.

I have mentioned this on numerous occasions and have always been told that the lead content was insignificant and therefore of no particular importance.

N13377 I BASIS OF NEW INDUSTRY--Leaded zinc oxide, residue recovered from the "bashouse" atj * I Anaconda Copper Minin* Co