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July 21* 1939 Hr, J, J, Bloomfield United States Public Health Asso, 7th and Independence Avenues Washington'* 0, 0, Dear Mr* Bloomfield: ' Please accept ray thanks for your kindness In sending rae a copy of your letter to Dr, Sehrenk, I am afraid I shall; have to ooEfoes to a certain carelessness In having mis quoted you in ray talk at Northwestern University in September of 193?* Hy use of the figure J milligrams per 10 cubio meters which# by the way#: was not a part of ay manuscript# hut was thrown out somewhat paren thetically, was hased- on a misconception of the meaning of one of your statements in the? literature, Aa you are aware# there has been a certain looseness In the use of these limits in that sometimes they are spoken of in terras of the quantity of lead which presumably may be inhaled per day* whereas sometimes they are given in terms of quantities per 10 cubic meters of air, X made the mistake in this instance of thinking that you had used the figure of approximately 1,5 milligrams in reference to the daily intake by inhalation rather than In terras of the quantity in a known volume of air, I have since recognized the mistake and have corrected it wherever the opportunity has presented itself, The error# I believe# was explanable though not quite excusable# and I am sorry that it has occasioned any difficulty of any kind, 2 can assure you that in ray own. practical work* I have considered that the concen trations in air should be under 2 milligrams per 10 cubic meters. In some Instances* by reason of the nature of the material disseminated into the atmosphere# I have urged that the limits be lower even than 1-1/2 milligrams per 10 cubic meters# Incidentally some of the work which we have done lately* particularly In the steel industry'# has brought me into contact with some of the men who were present at Northwestern# and I have made It a point to correct them as to your position. I am HAS*Is * 2 * With kindest personal rogarc Cordially yours* ^berf]"^'# u Ke'iS'e r""M.'>7 hb