312 MANUAL OF EQUINE MEDICINE. 



ing from side to side, and from the arch to the top of the process at the 

 point of its bifurcation. On the lateral and anterior part of the body 

 on the left side the disease had made equal ravages, extending into the 

 foramen at the base of the odontoid process. Immediately above the 

 transverse process, on the same side, the destruction of bone extended 

 from an inch and a half upwards and backwards, invading a nearly 

 circular portion, and removing a large part of the articulation formed 

 by the left half of the spinous process of the dentata and the anterior 

 articular process in the third vertebra. At the antero-inferior part of 

 the body of the bone, the disease had established a complete communi- 

 cation, nearly an inch in diameter, with the spinal canal, but the dura 

 mater was not destroyed. 



In all the affected portions there was a considerable quantity of 

 bony material removed, forming large cavities, which were filled 

 with a reddish -looking mass, presenting precisely the same appearances 

 as those of the lumbar spine. In the third and fourth vertebrae 

 the lesions were less extensive, but showed the same characteristic 

 appearances. 



Symptoms of Tumours of the Cord. — The symptoms 

 of spinal tumours will necessarily vary much, in accordance 

 with the seat and extent of the tissue invaded. 



In many cases there is muscular spasm, followed after- 

 wards by loss of motor power. There is pain on pressure 

 over the seat of the tumours, and symptoms are of slow 

 progress in most instances. 



In those cases where symptoms of paralysis or loss of 

 function are manifested, recovery cannot be hoped for, and 

 treatment is of little avail. 



SCLEROSIS OF THE NERVE-CENTRES. 



By sclerosis of the nerve-tissue we understand an indu- 

 ration or hardening of the textures in varying extent and 

 situation. 



Sclerosis of the nerve-centres is not of common occur- 

 rence among horses. We have met with more than one 

 instance of sclerosis affectins; the cerebellum. 



Mr. liobertson also records some instances affecting the 

 cerebellum and the spinal cord in adult horses which had 

 been subjected to hard work. 



Etiology. — Hereditary predisposition, overwork, exhaus- 



