5^4 CLINICAL VETERINARY MEDICINE AND SURGERY. 



Eggeling of the ambulatory clinique at Berlin, 22 were malignant 

 (29 per cent.) ; 20 sarcomata (27 per cent.) ; and 2 epitheliomata 

 (27 per cent.). 



A pathological report by Johne comprises a description of all the 

 new growths seen in 4439 animals examined after death at the 

 Dresden school during a period of sixteen years : — 



Of 1181 horses, 128 suffered from tumours (11 per cent.) ; of 1600 

 dogs, 93 suffered from tumours (5-8 per cent.) ; of 1658 oxen, 104 

 suffered from tumours (6"3 per cent.). Among the 128 tumours from 

 the horse were 60 sarcomata (47 per cent.), and 28 epitheliomata (22 

 per cent.). The 93 tumours from the dog furnished 48 epitheliomata 

 (52 per cent.), and 26 sarcomata (28 percent.). The 104 tumours from 



Fig. 85. — Epithelioma of the mammary 

 gland (bitch). The centres of the alveoli 

 contain a hyaline substance. 



Fig. 86.— Epithelioma of the mammary: 

 gland. The central portions of the alveoli 

 are occupied by degenerating cells. 



the OX gave 36 sarcomata (35 per cent.), and 8 epitheliomata (8 per 

 cent. 



The differences revealed on comparing these clinical and anatomo- 

 pathological statistics are explained by the fact that the lirst referred 

 almost exclusively to external tumours, whilst the others took note of 

 the total number of new growths found in different organs. It is also 

 well to remark that the majority of these statistics were collected at a 

 time when the lesions of actinomycosis, bothryomycosis, and tuber- 

 culosis were included under the title "of sarcomata. 



But taken as a whole the results given confirm the greater frequency 

 of epithelial tumours in the dog as compared with the horse and ox; 

 and they again show that in the herbivora these tumours are not so 

 exceptional as is generally suggested. 



Histological Appearance. — All authors agree in recognising the 



