Show tests ests prove that tar causes cancer ck t compounds that produce disease are identified I 1 I 1 nh n it lim I 1 ii nt I 1 ei in n ion nn n fiat lar 14 1 chiq cn il it if of I 1 irli r I 1 I 1 ini im on till cir C r t nt tit if or dr rt fill 11 I 1 I 1 altti I 1 it h and nn others tu clcil ded in Ir arduin duIn canair exi in loer animals b by y a 1 fir all in n if f tar ir duil duts no no fa its lemalle atto inapt to lite lie par nicular cantor producing pro duIng compiling bomp aundo of tur tar aas possible sIbIe in ili on an article in a recent cumber number of it the J journal ur dr I 1 I 1 ienna henn bennaway away ay of the cancer hospital in statute indicates what fraction fractions of 0 coal tar are capable of producing ann tin and ILse riles his ills attempts tempts nt to identify the he cit ricer pro producing dueing rub sub stance araon amon them doctor P enna ways which have con tinned for many months were made under the of doctor I 1 elicit vi who ito Is direct director ur of the research tuti institute tute produce r in laboratory the forms of tir vir most important in the he study of cancer doctor henn kennaway nay finds are lignite tar gas works tar producer ans tar coke oven tar and nd last blast furnace tar of these the first four our probably cancer while the last one mie does not doctor henna way may has collected evidence el eNi dence of ef feet of each of these but bill stances on the men engaged d in producing tiera and by bt aPp applying lYIE certain of them to the skins of mice he has been able to produce cancer in the lut luto o atory the industrial evidence eTi dence alone shows that the cancer substance Is present in the higher boiling fractions namely creosote ot of oil and hence in the green oil and crude and pitch he lie writes the experimental el evidence dence supplements this tills by showing that lie the substance Is not in the tot olid ids suspended eus sut in oil and that it Is pre present tent in the highest highet tolling boll lne dis tillage obtainable from pitch ft it may distill oer through an interial of temperature extending roughly from 2 degrees C the chote frac lion tion to above WO degrees C the pitch distillate that Is oler a range of degrees or more causes most case cael nigh temperature coil coll tor tar doctor kennaway finds produces far more cases of industrial cancer than all the others the petroleum ja of pennsyl Ienn syi vania and canada do not according to the evidence produce many auses of cancer thus far the attempts made to find the cancer producing product ae substance ambuj amon ll 11 ki n r n li it I 1 unta life if f cf III fur lint alvn ain molls uti lit n ro 1 I 1 it t r N 1 i n lu is in indu I 1 if I 1 x II 11 n w u sl 4 II 11 it 11 I t enlik I 1 13 11 it 11 till mil pont I 1 IN lit it 11 i 4 it i und as n mi unan n v Is tinni bli and 1 r fit in hill ant 11 a an squall us as choie f lit 1 I 1 a nilus in fit fods f UK as la in the nc n c of some lio ninnes lie its 11 I 1 I 1 tl in mit he be long lilied en ein mon iery pry conan grated can ie le rhe sti 1 I lit I 1 lire tire known n lo 10 be arsent in coal tar liae been I 1 cause lioy they are abend it t or stable or calel capitle ie ot of forming for tit mit defined compounds compo uni unis the lie un unknown knon sub otance i fire unknwon lecause they liae haie not these properties and the c cun 11 n subs sub staneL may way will ucil be among thein them |