250 DISEASES OF THE XERVOUS SYSTEM 



salol, salophen, antipyrin, etc. As a tonic strychnia should be used in 

 combination with arsenic or quinine and lastly the galvanic current 

 has produced good results in some cases. 



I^. Strychnine muriate, 0.005 



Aqua distil., 5.0 



M. F. 

 Sig. — As a hypodermic of 1.0 to be injected once daily. 



I^. Physostigmin sulph., 0.05 



Pilocarpin muriate, 0.1 



Aqua distil.. 20.0 



M. F. 



Sig. — 1.0 injected every three days. 



Certain Diseases of the Spinal Cord. 



The following diseases are caused directly and indirectly by some 

 change or morbid condition of the spinal cord. 



Compression of the Spinal Cord. Myelitis by Compression. — By 

 this name is understood a slow compression of the cord; due to a patho- 

 logical process which alters and straightens the vertebral canal; this may 

 be due to thickening of the membranes as in pachymeningitis spinalis 

 ossificans, already mentioned, from tumors of the vertebra or meninges, 

 exostoses or inflammations of the intervertebral discs. As to tumors in 

 the vertebral column very little is known in dogs; sarcoma; cholestea- 

 toma, and melanoma have been found by a number of observers, ex- 

 ostoses projecting into the vertebral column may be caused by periostitis 

 of the intervertebral discs of the lumbar region; this is frequently seen in 

 old clogs. Inflammation of the intervertebral discs is caused by violent 

 and continued jumping, particularly in performing dogs. These forma- 

 tions are at first soft formations, which later become hard and project 

 into the vertebra and in advanced cases project from one vertebra to 

 another in spine-like processes. While the dorsal lumbar vertebrae are 

 the most frequently afTected, it has also been observed in the cervical 

 portion of the column. 



Clinical Symptoms. — The symptoms are those we would find as a re- 

 sult of compression of the spinal cord and the origin of the nerves. The 

 animal at intervals shows pain, moaning, barking or howling, stiff cautious 

 movements, and evidence of partial or complete paralysis of certain mus- 

 cles of the body, also motive disturbance of the bladder and rectum, erec- 

 tion of the penis. Certain valvular diseases of the heart, causing a venous 

 hypersemia, arterial anaemia of the medulla spinalis or thrombus of the 

 femoral arteries produce symptoms similar to this disease, and it is well 

 to carefully examine the heart in a case of spinal paralysis. The treat- 

 ment is useless, as it is incurable. 



