ON RESPIRATION. 125 



are constant, though not always equal, their 

 violence being increased by exercise, which 

 naturally demands more frequent and more co- 

 pious respiration, as well as by some other cause. 

 Dissections of the dead subject afford little or no 

 proof of the nature or existence of nervous com- 

 plaints, hence it is not possible to ascertain 

 whether a paralysis of the diaphragm may con- 

 stitute one cause of broken wind. We must 

 therefore recur to such causes as admit of ocular 

 demonstration, and, of these, none are so dis- 

 tinct as the general thickening of the substance 

 of the lungs, just mentioned. 



A^^iTH regard to water in the chest, it is fre- 

 quently problematical, on examination of the 

 dead subject, whether the extravasation took 

 place before or after death. 



Another imperfection which may be in- 

 cluded in the class of diseased respiration, is the 

 sound which arises in breathing, with some 



horses. 



