Document EvmXdEw7YV0OGngBQxKLq4VYb

11. Inhalation Sroerlrcnt vith "XLng;s floutsi: usbestoa Curt Th* first inhalation fccpcrinent conducted at the Saranac Laboratory vith asbestos dust was begun Is 1/23. Aairwis lr.ho.Lad the dust far periods up to nearly three years and scaa guinea pics lived for about four years after their first exposure to dust* 1 preliminary report giving oboerratioos after 29 aonths of exposure appeared in the February, 1931 issue of TK3 JOGRRAL OP 132USTRIaL KTuIENB.* It that tine observations corerred a period of only 2-l/U years and the conclusions as to the ultinat* effects of inhaled asbestos dust vers provisional. Results of the completed study shrr that most, of the conclusions drawn in the preliminary report vers substantiated A complete review of this experiment follows. 12. The dusting saterial vaa a cocraircial variety of asbestos dust known as line's floats and vac composed of short fibers and particLas of variable sine. It van obtained frees, the Thetfori, Quebec plant- of the Asbestos Corporation of Aaarica* 13. The~dust coesnositing (Table 2/ reveals that the amount of fibrous chryse tile w only lu per cant, a rather low value. However, thera vas suf ficient fibrous material tc produce a characteristic fibrosis. lu. The dust cooceptratior, at first vas quite Lor and fur irpiagsr eeapies taken toon after the eeperinent vae started, th* average light fisld count- by the standard technique js only 6.0 sdllios particles per cubic foot of air. An appreciable ntxiber of Lars* partidea (or filers} also **rt present, u STtDIZS OH EOrailCXTIL FifflOCCCSICBIS. 71. InhaUUon of Aabesto* Dust., Gardner. L.U., vxS Cuntaga, D.E. J. Ini. Hyg,, 13* 97-Hit, 1931.