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field, give nutliority to their book cnt.itled " Industrial Dust." Written front the engiiieer'n stnridpoint, it pmscnt.s, in n convcrticnt forin, the results of work especially of the Aniericnn sc11001, but it includes HIRO references to iiiiport,nnt work done in otlier centres.
The mediciil nspects of erposiire to dust iind fumw are bricfly but, for the purpose of the book, ndeqiiiitely tlcalt with, nnd sonic reference is niiide t.0 the prcvi11e11co of plmonnry disense in relation to the coniposition, coiicexitmtioii iind physical ineasurenient of dust c l o ~d s in different indust.ries, special proniinencu being give11 to silicosis, which is by ftir tho most, importtint of the pneunioconioses.
The suppression of dust in n niimber of occuptitions in never likely to be rompleto so long 11s the process is coiit,iiiued, but in the effort to appronch coinpleteueas the question of " perinissiblo dustiness " is inevitnbly mised. " The idea of iidopting tltiindnrtls of perinissible dustiness for cncli harniful duet liris II niedico-legnl appeal that is uot at all jast.ificd by the data iiviiilitble toduy.
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