Document a23g74yE7RDQ6v7nGQJvyJga

June 21, 1*57 Dr. Kenneth W. Smith Medical Director Johns-Manville Corporation 22 East 40th Street New York 16, Ner York * Dear Ken: We are enclosing a copy of the Pomcrleau report. Thank you for the information and reprint regarding the solubility of asbestos fibers. I have embedded some of my superfine asbestos fluff In paraffin and had sections cut of it. This was photographed under dark field conditions. The same field was rephotographed following incineration, at 550 *C. and treated with concentrated KCl for 30 minutes. Neither 1 nor Hal Schrenkt nor Dan Braun, nor my co-workers at the laboratory, could detect any differences In the photographs. However, the material is fairly densely bunched, and, to obviate this potential criticism,' X am repeating with a thin smear of this exceedingly finely divided asbestos. 1 shall send you the photographs. In the meantime, 1 have asked that the manuscript be returned for revision. If we find that we arc on Insecure grounds, wc shall delete all reference to the paucity of asbestos dust deposits in the lung. However, 1 still would like to leave in a statement that asbestosis is to be regarded as a non-progressive' disease not in contrast to the demonstrated progressivencss *of silicosis. As I recall, we made some corrections on your copy of the manuscript. I would like to incorporate these changes in our revised version, i/ould you send me your copy for this purpose. After the revisions have been made, 1 shall send you a copy for your approval, and, if you approve, 1 shall then send it to the editor. Dr, K, W. Smith -2- Jane 21, iV-7 .. . > Any comments on the long cancer case in which I could not find the primary? Sincerely yours. PGthg Enclosure Paul Gross, *V. D, Research Pathologist