Document qar09JX11qQQQraZLV6BNNjMG

fiZX iM J J/ J 1. Tissue and smussl susceptibility ni noted la the experlaents. Individual susceptibility to the dust snang our snployees ha a boon notad for nan7 7*rs. 2. la always M*a hallavad that tha action of the dust as Mechanical and not ehml cal. if thara was an add*! cbmleal effect, I bailora that wa vould saa countless eaaaa of aabastosls because ee bare had hundrada of mo exposed to high eons nitrations of dust. 3. The theory of tha action only by long fibres of 20-50 nlerona la, at first, hard to accept because t (a) I personally hare heard tha late Or. Gardner say that probably tha aost daageroua lengths of fibre for tha of asbestosla are those of 5 to 15 nlerona (b) In Or. Gardner's letter to lr. Sabourln of Peb.23,1944, ha statea: *1 ballara that tha tna htxard la asbastaa plants la proportional to tha anount if snail, lndindaal uncrushed fibres In tha atnoaohara. . sUVpeut thna-WMr* reason only one fdil llltxa or so typleal asbestosla la ths niass and nllla is because there la probably too little such fibre la the air of theta plants. Conversely the reason for tha typical disease la tha fabricating plants la tha fact that tha processes thara open tha bundles of asbestos flbrss sad tsar than Into lanxtha xTWfl mint to be inKale3~ln dangerous quantities!. (e) In tha 0.8. Public Health Bulletin /2U entitled A Study of Aabestosls in the labeatoe Textile Industry* it Is stated that the aedlua length of flbree range from 7 to 16 nlerona In tha plants studlad. Dust counts around tha nixing plekars and cards shoead tha loeest percentage of fibre and tha shortest lengths of flbrs and It was aaong thase nan (pickers end carders) that the greatest aunber of asbestosla eases occurred. Sowever, la spite of these three rtatanents, I would prefer to believe la the action only of tha long fibres sad aecept thase recent Sartaae findings becauses I - Ths dust counts la our nllls shoe 65$ - 80$ of tha fibres are 5 nlerona or lass In length and rsrsly 1$ are 20 aleroas or longer* and sa hava relatively fee asbestoslJ eases. Tf - The recant Saranac studies have sheen that aabestosls will develop in an ataosphere of 138 l.P.P.C.J. total count of whleh only 0.6$ ears fibres longsr than 10 nlerona. Ve have had naay areas la our nllls where such counts could hare been found.