mouth of the trachea, or windpipe, whilst others 

 consider it solely as a disease of the iungs. 

 Whicli of these theories is well-founded it is not 

 easy to determine, as dissection of the dCad 

 subject does not always point out the sources 

 of disease. A thickening of the membranes of 

 the mouth of the trachea frequently occurs, 

 probably from inflammation, arising from the 

 custom of pinching that part of the windpipe, 

 to ascertain if a horse be sound in his wind, 

 and this circumstance may possibly be one cause 

 of the disease. 



CRIB-BITING 



Is a defect which, when its consequences are 

 duly considered, must be universally admitted 

 as a cause of unsoundness. It consists of a 

 habit which the animal acquires of laying hold 

 of the manger with his teeth, and drawing for- 

 \rard his windpipe witli a convulsive motion, 

 accompanied w^ith a slight grunting noise. 

 During this action it is generally supposed that 

 he sucks air into the stomach, and distends it 

 to such an enormous size as to produce great 

 inconvenience to him when put into a quick 

 j)ace, which inconvenience never subsides until 

 a great quantity of air is parted with from the 

 anus or fundament. 



K 



