Furthermore, variations in gasolines from different sources, and in various parts of the country, bring about a wide range of concentrations of tetraethyl lead required to bring the gasoline to a certain minimal anti-knock standard.

-2- 1 gallon gasoline 3 cubic centimeters tetraethyl lead 1,5 cubic centimeters carbon tetrachloride During the period of the test a record was leapt four times daily of each car paired in the garage.

"TETRAETHYL LEAD f IN VICTIM'S BRAIN".

I will discuss the hazardous Jobs involving the handling of tetraethyl lead, in the order of their hazard, discussing the most hazardous first.

In this connection it is needless to say that the poison ing from concentrated tetraethyl lead is not something that manifests itself by one or two absorptions* but is more apt to creep on gradually, sometimes not actually manifesting itself until a person is seriously ill.

Sayers, working with tetraethyl lead in 'Sarying from 0.35 to 10.4 mg. per cubic meter of air, found that only * aipjetained and attributed this limited retention to the small particle gpWzSW/owji agtudies gave rather conclusive results, showing that the percentage ||sely proportional to the minute volume of air breathed and to the ^^jyhereas-it-is-directly-proportionahto-the-particulata size,, density uwm?

Kehoe in charge of our medical work for several years, and believe that he has had more practical exper-ience in reference tothe actual as well as possible hazards that may be associated with the handling of tetraethyl lead and Ethyl fluid than anybody else.

May 8.-- A t the hearing General to be May h2e0ld before the Surgeon on ethyl or leaded gasoline, Thom as Midgley, jr., Vice an attendant bring a quantity of pure tetraethyl, washed his hands thor oughly in the fluid and dried them on his handkerchief.

Shore are a great number and- variety of- physiologi cal problems in industry which involve- the health of employees and public. .hat an importance such problems can assume is illustrated by the history of tetraethyl lead Which is not yet a closed problem).

Yi/HY CONTINUE WITH TETRI ETHYL LEAD?

Professor Preti's examination would, seem to confirm the views expressed by yourself and Dodds namely, that the complaint from which this man is suffering has no connection with tetraethyl lead.

Ficlduer Hovember 7,1923*CL-BH Superintendent, 175Bureau of Mines, Pittsburg, Pa C SCBJBCTi Physiological Effects of Ethyl <3as Pear Ur# fte In the Minute* of your Problem Confereno# of the cnealoal Division, October 27, X note under Bil69, the above title, and I believe that 1 recall that Midgifcy toll m his Company had decided to adopt the trade name "othyl gas*" Of course, their object in doing eo are fairly clear, and among other thlnge j they are not particularly desirous of having the name "lead" appear in this oae* That is alright from the standpoint of the general Hotors Company, but it la quite a question in my mlhd as to wither the Bureau Of Mines would be justified in adopting this name 0 early in the game before it has haa the support of popular usage The reason for wy objection are as followsi (1) it will lead to confusion, especially if the name ever beoomes^w^d^f^used, as there are many other ettyl gases b e s i d e ^ t e t m e ^ V l leadi () since tbs real ob ject of our investigation is to determine whether or ; not lead 1 deleterious in the combustion products, it * seems to me that we would be wise in our investigations \ to refer to its chemical name "tetraethyl lead, or one of tbs other ones possible This is merely ay personal feeling, and X am open to conviction.

Prophylaxis in Industrial Lead Poisoning.

These facts lead me to believe that we are dealing with hazards wliich are capable of producing lead poisoning; that these hazards are avoidable to a very large extent; that it Is both unwise and dangerous to the future of this industry, to permit the con tinuance of these conditions.

Concerning the questions asked:- number one, the use of rubber gloves Is, of course, for the purpose of providing a material impervious to tetraethyl load.