Symptoms. 



337 



characteristic smacking sound. Later tliey entirely cease to 

 eat. The animals stand immovable with a staring, expression- 

 less look, saliva dropping in long, sticky threads from the cor- 

 ners of the mouth. They like to play with their mouths in the 

 water offered them, and some patients evince an increased thirst. 

 The mucous membranes on the inner surface of the lips, 

 and on the gums is warm, dry and reddened ; the opening of the 

 mouth, which is followed by a flow of great quantities of 

 accumulated saliva, reveals a similar change in the mucous 

 membrane of the other parts of the mouth. On the second to 



Fig. 57. Foot-and-mouth disease. Vesicles and ulcerations on the gum, the latter 



also on the nostrils. 



third dav of the affection smaller and larger vesicles develop 

 on the inner surface of the lips, and on the gums lying opposite, 

 or on the toothless part of the upper jaw, on the top and borders 

 of the tongu-e, in the vicinity of the f renum of the tongue, as 

 well as on the inner surface of the cheeks (Fig. 57) . These vesi- 

 cles are in small animals hardly ever larger than the size of 

 a pea, while in larger ruminants they may attain the size of a 

 nut, and on the dorsum of the tongue may even reach the size 

 of an egg. The vesicles on the tongue (Fig. 58) possess a thick 



Vol. 1—22 



