Modern surgery, general and operative . bed as causes, viz., bacteria,protozoa, and yeast fungi. This theory was discussed on page 348. We do not regard it as proved,and even Plimmer, warm advocate as he is of the theory of contagion, admitsthat as yet there is no clearly demonstrated case of contagion of cancerfrom one man to another. I can find no authenticated case on record of asurgeon having been infected by cancer during an operation. Transplanta-tion has been carried out from one animal to another of the same species,although attempts to do so usually fail. Tyzzer, of Harvard, succeeded
Modern surgery, general and operative . bed as causes, viz., bacteria,protozoa, and yeast fungi. This theory was discussed on page 348. We do not regard it as proved,and even Plimmer, warm advocate as he is of the theory of contagion, admitsthat as yet there is no clearly demonstrated case of contagion of cancerfrom one man to another. I can find no authenticated case on record of asurgeon having been infected by cancer during an operation. Transplanta-tion has been carried out from one animal to another of the same species,although attempts to do so usually fail. Tyzzer, of Harvard, succeeded mnearly 46 per cent, of his inoculation experiments with the Jensen tumor andhe has kept up the tumor formation for ten generations. (See Fourth Reportfrom the Harvard Medical School of the Caroline Brewer Croft Fund CancerCommission.) It is a serious question, however, if mouse cancer is reallycancer at all. Mouse cancer is far more strongly hereditary than humancancer; spontaneous cure is by no means uncommon; metastasis is rare; 25. Fig. 179.—Epithelioma of right temporal of right side of face. Papule noticed bypatient two years prior to admission. ^86 Tumors or Morbid Growths the disease may occur as an epidemic in a laboratory. It has been assertedthat mouse cancer may revert to sarcoma (Apolant, in Miinch. med. Wochen-schr., 1907, liv), and it may revert to adenoma (Ibid.)- These tendenciesseparate mouse cancer very positively from human cancer. It is said thatepidemics of fish cancer may occur in a hatchery. Cancer has not been trans-planted from an animal of one species to an animal of another species. If aportion of human cancer is implanted in the tissues of an animal, the cells ofthe growth retain their vitality for a very few days and then perish. If a pieceof mouse cancer is transplanted into a rat the same thing happens. In anycase, even a successful transplantation of cells is a very different thing fromcontagion. The late Prof. Nicholas Senn
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