Document 3JwBQ8gpmBZQexMy3BGzaXyKn

ee Annals New.York Academy of Sciences Nayelachmidt V: r. * n I 'i *>' [.si*1 ( PfL. . II,*;..:-*c.: ,v in!*,* iSiWrl , $4 iW-Jnft % *..V... I';:;" tractive index in the liber direction, with ny moet near 1.70 but varyiai' :< them, or what propo down to 1.6S. No clear evidence wee obtained lor the presence, in the last f/ etcoytiliable as fibers. duat, of eroeidolite or chryeotite.' Ianw a* later puuubjlgicawtiovno oBveyyetrr u(1w949/i/1w06v0;) quuecsiitiionerad tmhe iQdeeniutinflcusntioii. .. Thu Lunp' .7D.unt C by Sundius and Bygdta, of the asbestos as a hornblende variety and trW' ^'^Several yeara ago a to prove that theyhad in fact been studying a chemically altered chrysotHi,' '|i`hTlnes Research Estal but his arguments do not seem convincing. , :y.f aabestosis. Moet of The only later work to be mentioned here is that of Beattie and Km* _i^th# London Pneumooo (1961). These authors examined samples of lung,)ytnpb gtands, and pleun ^'jiesearch Unit In Cat of 60 people who had been exposed to asbestos, mainly chrysotlle. for prv : Jhlnimal, moderate.-'or longed periods. They distinguished four grades of aabestosis, none, minimi v?tsrla given by Beattie moderate, and severe, and determined the amount.of mineral dust obtains! j&jn. timet cases who' he itoue aampl^iuidjei^a^tit^^.'aah'Svllh'w:t^'ih-i^n^ liwpneehtative 'aandiJei '.H6.1 V) hydrochloric acta. They expressed these weights as mg./gm. dried. muteed. tissue. ground lung were as> ^determined chemically . I.C.VC Taan .l... .. ^treated with 0.1 N hyx; Lwtovn Akaltm ni Aararosia, Arm Beattk awn Khox-{1961) -l ^mineral residue/for . -----................... !?C-r*y dlffrection.;; '/: Grade oi Aabestosis jj|'iThe object of thie'a- Vfjbiicompletely as poesi None Minimal Moderate ;Sever:Kfat0e a possible. Expe .Number of cases Mineral content mg./gm.7,4f$d 3ipjN&| ' ' dried lung* .. n teTDoat exp<^ure,jrem.^KSsM5 ^ "^"Bhodesia (previously ^aamplc) and ^Ith^nw ydroehlorieaetdir'd . finally used as ?'*8urv.lwd,: years''.* V> "/**.77'-'V'' V- ~.,:' Dust accumulation, mgygm.'^er^ AvmAoe. Qi r.-yf}^^'g^jrtye mf./gm. equalsl gn>. la a pair ot tonga ot KO gm. dry weight. r vWfare eonoerned. here only wlthxhe osta for theluhgs, which are sUW -M_,- * 5, , ' v V tn*H**d in TABUt l.There ia.no dear correlation between the average luai |9tasldot per eent .drtec )}- dust concentratiM npQtht grade of asbestosis.' but thelungs ylth;thi ^Jieaa?"s ./?].; ` ^*l***t] grade of tibroeU' had .the longeat auryival;fntery3 ^periodjtotwetf. M'-.iRange ti r-x&M.otf !d^.uU*aVt expoesure.and death), and the.lowv est calculated dust afpjumtle; #li? <Wo. of_.s_a_m_p_le_ s V W!-1' . l"ol . V;7 vj ., Residue in grams in b !. little and Knox also counted and measured the eeWstos fibers in the residues, and they found that in severe mtbcslosls the proportion of longtii'j.::-. Mean '7; fiber* (above 16 ft 1 to all fiber* or particle* was considerably lower tHllt'," .' yj0, 0( eaniplea In the thrx: other grades, but they s*y nothing about the nature of thijS atA. `'VVt' 6000 096) r'' 1 mw m PRODUCED BY FORD