THE NERVOUS SYSTEM. 213 



and traumatic cases have been recorded as affecting the 

 dog. We know as little about the pathology of tetanus 

 in this animal as in others. Coats finds on post-mortem 

 examination in tetanus the central nervous organs hyper- 

 semic. In the spinal cord, medulla oblongata, pons, 

 corpora quadrigemina, and corpora striata, a granular 

 material around the vessels, probably an exudation. In 

 the medulla oblongata a longitudinal vessel at the posterior 

 part was noted as especially affected, and here, as in 

 other parts, there were occasional hemorrhages. In 

 the convolutions an exudation of a yellow fluid outside 

 the smallest vessels, the medium ones (those most affected 

 in the cord and medulla oblongata) having mostly escaped. 

 And with regard to treatment it has been shown that if the 

 animal be left in a state of perfect quietude and repose he 

 may recover, but if subjected to officious treatment he will 

 most certainly die. 



The above-described are the principal nervous disorders 

 of the dog ; those to which the nerves and the sympathetic 

 centres are liable have not yet been made the subject of 

 special study. Neurotomies and nerve-graftings have 

 been performed only by physiologists for experimental 

 purposes ; they are not yet embraced within the domain 

 of curative surgery. 



