ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



41 



in some cases the tongue in toto. The growths were typical of cancer 

 of the tongue, showing invasion of the muscles. No metastases were 

 found. 



In addition, out of 59 white mice which survived the infection for 45 





Fig. 1. — Sjnroptera carcinoma of the tongue in rats. 



days or more, 3 developed carcinoma of the fundus of the stomach ; but 

 whereas in the rats none showed invasion of the muscularis of the 

 stomach, in the mice 2 showed invasion of all the layers of the stomach 

 wall. This he explains as being due to the early death of the rats 



Fig. 2.—Spiroptera carcinoma of the tongue of a rat. 



(9 to 10 months after infection in longest-lived) compared with the 

 later deaths of the mice (16 and 13 months respectively). In one case 

 of mouse carcinoma transplantation of the tumour was successful through 

 4 generations, with 28 successful " takes " in 55 inoculated mice. The 



