Document XOq1gaDG8oveoNokLKxb4nZ64

,Jxm & 15 1933 Dr. P* G. Shipley Johns Hopkins Hospital Baltimore, Maryland Dear Dr. Shipley: One of my associates, Mr* Cholak, who is working on quantitative spectographlc estimations of lead, is very m e h interested in the work which pou and your associates have reported in your article The Spectrographic Detection of Lead in the Blood as an aid to the Clinical Diagnosis of Pliunbisjn*1 in the Bulletin of Johns Hopkins Hospital for November 1932. He is especially interested in the fact that your controls gave eifchor negative results or questionable traces' of land* 1/ould you be kind enough to let ns know what lino or lines you liave been using In the detection of lead. Various lines are reported in the literature as for instance P) 3683*5 aU(^ i-{.0p?*8 ere reported as being the most sensitive. At present we are using- 2833*2 and we have also mad use of 2853*2* With the latter we liave been able to detect O.Qto milligrams in a hundred c.cs. of blood, using 0.1 c.c. in iho negative crater. Our own work is now in the preliminary stages and I am asking, therefore, for the purpose, of obtaining information since we hope to profit by the experience of other workers in this field. Allow me to thank you in advance for your courtesy. Cordially yours, RAi ;XS K'f 0020111