130 CANINE AND FELINE SURGERY 



platform (B). When the dog placed his weight on this 

 platform, the \-alve was raised, and the \\-ater trickled down 

 through the spout (C). The intelligent animal soon learnt 

 to put his mouth to this, and used to utilize the apparatus 

 whenever he wished to drink.^ 



Hare-lip and Cleft Palate. 



For a description of the operations for these conditions, see 



p. 94. 



Tumours. 



The most common varieties of tumours found in the mouth 

 are papilloma (wart), carcinoma (cancer), and sarcoma. 



Fig. 100.— Mouth of Terrier, smothered with Warts (Papillomata) on 

 the Tongue and Buccal Mucous Membrane.''' 



Papilloma or Wart. — These are often multiple, so much so 

 as to almost completely co\'er the tongue and mucous mem- 

 brane of the lips (see Fig. 100). That they are contagious has 

 been demonstrated by a series of experimental observations,^ 



1 For the sketch of this apparatus and the accompanying history I am in- 

 debted to Mr. Cyril F. Jackson, Hon. Secretary to the British Bulldog Club. 



2 For this photograph I am indebted to Mr. Philip Vincent, M.R.C.V.S. 

 ^ Journal of Comparative Pathology and Tlicrapeutics^ vol. xi., p. 341 



(McFadyean and Hobday). 



