AUSCULTATION. 



511 



requisite to convey an impulse from the ultimate cells to the 

 larger bronchi. 



Some consideration of the existence and pitch of these 

 sounds in the various regions of the chest, and in the different 

 animals, is essential. 



1. Horse. In this animal it will be remembered that we 

 can only auscultate with profit behind the shoulder. This is 

 scarcely true as regards young foals, and very thin animals, 



Fig. 134. DELAFOND. Horse's chest opened from the right side, and indicating the 

 positions of the heart and lungs. 



in which the shoulder is moveable, or so destitute of muscle 

 that it can be auscultated on the antea and postea spinati 

 fossae. Even in these, however, and especially in the latter 

 case, the sounds of respiration are so mixed up with those of 

 the heart or large blood-vessels that they afford no very satis- 

 factory data. 



