Kehoe: We are trying to obtain some information on normal levels of lead in rabbit blood, urine, liver, kidney, brain and bone.

Threshold Limit calculated from the formula 250* SiO, + S ** Cnstobalite Amorphous including natural diatomaceous earth Tremolite 20 5 SILICATES (less than 1 % crystalline silica) Asbestos 5 Mica 20 Soapstone 20 Talc 20 Portland Cement 50 GRAPHITE (natural) 15 "Inert" or Nuisance Particulates SOforlSmg/m5 whichever is See Appendix 0 the smaller) Conversion (actors mppcf x 35 3 -- million particles per cubic meter = particles per cc e> Millions of parlulis per cubic foot of air. based on tmpiiigcr sjtnplcs counted h> light-field techniques n The percentage of crystalline silica in the formula is the ainnimt determined from air borne samples, except in those instances in which other methods have been shown to be applicable See "Notice of Intended Changes These substances, with their corresponding values, compose those for which either a limit has been proposed for the first time, or for which a change in the Recommended* listing has been proposed In both cases, the proposed limits should be considered trial limits that will remain in this listing for a period of at least two years During this time, the previously Recom mended Limit will remain in effect If, after two years no evidence comes to light that questions the appropriateness ol the values herein, the values will be placed in the ' Recommended" list Documentation is available for each of these substances Substance ppm* mg/cu m1 Abate Boron tnbromide Bromine pentafluonde 4 Butyl mercaptan *C Cadmium oxide fume (as Cd) Camphor Chlorine Cyanogen 44C Dichloroacety- lene C Diethylene C Diethylene tnamine- Skin Diphenyl amine 44 Endosulfen (Thiodan) Skin * Ethyl mercaptan Fibrous glass 10 01 05 2 1 10 01 10 - 05 - 15 01 10 01 $ Heptane Indene Indium and com pounds, as In Iron salts, soluble, as Fe Methyl isoamyl ketone Methyl mercaptan Methyl silicate Octane Oil mist (particulate) Oil vapors Pentaerythritol (tetra- methylomethane) Pentane Petroleum distillates Propargyl alcohol-Skin RDX-Skm Stoddard solvent Styrene Tetraethyl lead (as Pb)-- Skin Tetramethyt lead (as Pb) --Skin Tnmethyl benzene Tungsten and com pounds, as W Soluble Insoluble Uranium, sol and insol compounds as U 500 10 100 0!

Lead Control Troaram.

I have charted the data concerned with the concentration of lead in the urine of these normal individuals during the entire period of the control observations.

If you will refer to the map which wa used to discuss the areas of use of TM.L and mixed lead alkyls you will see we did not show the use of the individual antiknocks, but grouped them together under MLA's.

Titanium Pigment Corporation is a sub sidiary of National Lead Company.

The department is responsible for the application of physical analytical methods in the following fields: HONS 037674 -2- (a) Residue Analysis (b) Polyaromatics (c) Organo lead compounds (d) Lipids (e) Tobacco Snoke (f) Head Space Volatiles.

Asbestos Suits - Used in the TEL Area as a safety suit when breaking into pipe lines that could contain molten lead or sodium - lead alloy.

The calculations were made by Bruce fader. manager. techni cal serv.cps of the lead Industries Assn.

LEAD INDUSTRIES ASSOCIATION, INC.

Excessive vapor inhallatlon or skin oontaet can lead to an effect on the liver as is the ease with many chlorinated hydrocarbons.

TETRAETHYL LEAD.

In asbestosis, pulmonary and subpleural fibrosis distort the lungs and lead to respiratory insufficiency.

Instead, I received word from several sources (which I, checked directly) that he was quite certain that I was the creature of the "lead industries", and that he wished not to have anything whatever to do with me.

L IA14036 LEAD INDUSTRIES ASSOCIATION, INC. 0 MADISON A VINUI % NCW VOM, M.