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' ( r r % c / This physico-chem ical s tu d / la supplemented bjr general co n sid e ra tio n s o f H abootosln ha* n o t be?n ruopocto* b a fo ro *o n th , which shown th o .Im p o rta n ce o f the o o o n p n tlo n a l h is to r y in thp. atu-*y o f pulmonary ?lson9* ......................... r - IOM MtUON INSTITUTE OF INDUSTRIAL RESEARCH ^ITTSOUWOH. > zee = * z o- 9 B a o a o s o N \ ta 9 * 9 o n O * tl I ;oj i'S \A V is* !* J I \ % V rr 4 t MCULON institute or INDUSTRIAL, research "ITTtlUKOM. r*. XS 3. O- *J>Z c M S3 n O . ^ a na o 4 .C r? oq a* >. o M H, m* rs V O' c U` * * s . J c <M a- oH s M 6d uo A' Hn rt Qi. a- H ft M c. * H #M o a -H u <3 O sc a a oa sz 3 o nH no oM u 4* 4* <0 *c a 3 c 3 4ft Oo o w. oco ,0 cS a <4^ ft J3 4ft o ft n , o r o ftC \\ i ! 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A c e r ta in fib r e c o n c e n tra tio n in tho lung must bo prcoont to lib e ra te s u ffic ie n t s i l i c i c acid fo r tho production o f detootoblo fib ro s io , nonunTorical lim its , hovever, hare been established. Other s ilic a te s , e o ric lte , o to . p ro b n b lj a ct In a o ln d la r r a j. ' . \ HCXiOST ISCBTiJUTiS OV IWSCrSTTUAX. RnsnAIICTI. nrrsmntca. i*a. / t MELLON INSTITUTE OF INDUSTRIAL RESEARCH PtTTSaUKQH. PA.. 02 C 'Kemorandiun on A iib e s to s la I I I \ * ! m? 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PA. * Cz m m oX* Xoa O o 3 O w O mSC 9 * 3 o o> CO oo w a 11 \ ! ss o * A`> a a <? or V l I Bo 33 V( o s e \1 r C r C c \ V, V u w ro ro QM > lou | 90 oause4 a Tory serious fib ro u s re a ctio n In the lungs rr ( Mrx.z-ov IxsrrmjTR of I:cdcstrxa.z. Riseakci:. pn*rsi tTT bo ti. FA. m a o IT * sa o o e 3 aft fftt ft+ 9 9 * 9 3 ft* a . 3 (0 3 g e ft ft o3 ft* IS ft N o ** * CD 0' a ft ft > > rc e S x *0 o s- ia cr a : n O a i P* sft fOt r 3 s 5 *> 6 o ! a * 5* S. o a 3 e E a 5 3 4 * W oe B O ft *3 o ft ** Ol as 9 aft < & Cl CO a O fot s a i sr 9 a. 15 5 fOt 5T e a. > ca S fot- u * V r r r ( Mkzxon LNSimri'K op Iscdustriax. Rbsgaroq. PITTSBlIWOn. RX. >> jc c ?5 5 *o a Asbestosle, in c lu d in g Report o f Pure Cast r.( e. I t Mmyivoy Irramursi os* Issosrsii.ii Rxssaboh, nrrrsntrnoH. pa. Il C: X II *! o a * j F *5s 150 2 IS " 2i? Ei / Mbzaoit I***TTtrr or Ikdcptriax. 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