Document By5xaRjw4L348zq9LybvNkp3X

li PLAINTIFF'S EXHIBIT AB-72 1 ffovember 20, 1936 LeRoy U. Gardner, 11. D., Director, The Saranac Laboratory, Saranac Lake, He* York. Dear Dr. Gardner: At a seeting yesterday attended by certain braxe lining manufacturers, 'Ar. Simpson and I were able to present to a fairly large group of interested corporations the proposal that one of your dusting chambers be engaged for further experi mentation with asbestos dust. The proposal was very well.received and it appears that not less than eight, and perhaps .ten or more, corporations will participate In financing these further experiments along the lines discussed when we met with Dr. Lanza and Dr. McConnell a few days ago. Accordingly, you may consider this 'letter as an authorisation to you to commence the contemplated experiments with asbestos dust for the purpose of determining more definitely the causes and effects of a3bestosis. It is ay understanding that, among other questions which it is anticipated these experi ments will answer, are the following: (1) What concentration of dust is necessary to prouuce the fibrosis of the lungs which is designated as asbestosls. (2) Whether exposure to asbestos dust will produce asbestosls without the existence of previous Infection and whether the Y-ray changes found in advanced human asbestosls can be reproduced in anlc&ls without infection. (3) Whether the fibrosis produced by asbestos is of the progressive type, that is, will the fibrosis increase (once it has started) after exposure to the dust ha3 ceased. 004737 /' ^ >A / SPNY 000461