IV 



CARCINOGENIC CHEMICALS 



859 



Fig. 52. Multiple skin papillomas (p) on a mouse painted with methylcholanthrene dissolved 



in benzene. 



Fig. 53. Carcinoma of the fore-stomach (c) of a C3H mouse fed methylcholanthrene (see 



Fig. 52 for microscopic section). 



Fig. 54. Large pulmonary tumor (p) in a mouse injected with urethane. Similar tumors 



occur spontaneously and are induced by carcinogenic hydrocarbons. 



Fig. 55. Skin cancer (sc) in a mouse painted with methylcholanthrene (see Fig. 53). 



Lileralure p. 870 



