138 



PHYSIOLOGY OP FARM ANIMALS 



[CH. 



Besides the kinds of exostosis just described, osseous out- 

 growths may arise in other parts through inflammation indiiced 

 by injury as by a horse faUing or hitting 'timber' when hunting. 



Fig. 67. Photo of side-bone. 



Voice-Production. 



Before concluding this chapter it may be well to consider 

 briefly the mechanism employed by animals in voice-production. 



The larynx as described in an earlier chapter is a chamber 

 with cartilaginous walls and situated at the upper or anterior 

 end of the trachea, with an aperture (the glottis) communicating 

 with the mouth. It contains two elastic cords — the vocal cords 



