The evidence shows /that the lead exposure involved la so slight that it can not be measured by any of the methods which we have employed and which have been effective in measuring the lead exposure of persons in dangerous lead trades.

Such litharge is made by the makers of Dutch Boy red-lead and Dutch Boy white-lead.

Dutch Boy red-lead, the highest grade red-lead obtainable, is the choice of many ship-owners.

NATIONAL LEAD COMPANY New York, lit Broadway.

And lead on the market.

That is to say that the relationships between the lead concentration in the blood and that In the urine are very different In tetraethyl lead poisoning as compared vith inorganic lead poisoning.

.< "ihilij ihiiuf to STAND mu WfiATHER' 4 \* srr* iHhutt\uj K/i/^lot/, j S'. 1 \ JXXP Sf-; , . . and Just think NOW PURE WHITE-LEAD PAINT FREE : Send coupon for folder, " Painting with White-Lead" which telis'howjtlo mix pure white-lead-, paint from ..Dutch;1 Bdy iSoit paste White-: Lead.

Jcsepn Lead Company Lead Industries Association, Inc.

sateiy three ial-lli.3raas of * lead per ton cubic meters of air has been substantially established as the threshold of toxicity of inhaled lead.

I feel quite certain it will be found that the urinary lead concentration is much the best measure of lead exposure.

Lead paint, made with Dutch Boy white-lead,'does not crack or scale.

It will be , '*' v observed that the absolute values for TEL cover a wide range as does the ratio of lead from TML to lead from TEL.

Novel uses include: 1-lb. sheet lead sandwiched between two layers of polyurethane foam as a floor underlay and leaded vinyl in the door panels, both for sound insulation; also, DS lead tubing for the fuel lines and lead impreg nated iron connecting rod bearings.

That is to say that the relationships between the lead concentration in the blood and that In the urine are very different In tetraethyl lead poisoning as compared with inorganic lead poisoning.

Incidentally you will find adequate discussion of the matter In '^Occupational Lead Exposure and Lead Poisoning,'* a report prepared by the Committee on Lead Poisoning of the Industrial Hygiene Association.