TUMOUR OF THE CEREBELLUM. 303 



The tumours of 'the lung and brain showed the histological cha- 

 racters of sarcoma. They were exclusively formed of small cells, the 

 greater number rounded and flattened at certain points by mutual 

 pressure. All showed a strongly marked nucleus and vessels of em- 

 bryonic character, 



TUMOUR OF THE CEREBELLUM. 



4. Ten-year-old chestnut mare, sent to Alfort on the 13th March, 

 1897, by M. Laurent, veterinary surgeon, at Bar-le-Duc. 



History. — The disease from which this mare was suffering dated 

 from September, 1896. It had not developed in consequence of 

 violence. Nothing noteworthy was known as to the animal's previous 

 history. 



Disturbance in movement was the first symptom noticed ; the gait 

 was irregular, vacillating, and at certain times rolling. The animal 

 was unable to walk in a straight line, but turned to the right or left ; 

 movement was not co-ordinated, the limbs were excessively extended, 

 and most frequently flung outwards. At the least excitement the 

 animal lifted its head high and started back. If harnessed with ano- 

 ther horse it could still be used in the carriage. On returning to the 

 stable it did not appear unwell, and began to eat. 



These first symptoms gradually became aggravated. During the 

 later period the animal, if approached in the stable, hung back, 

 appeared terrified, rolled about on its legs, then stopped suddenly, 

 with the hind legs thrust far under the body. Left to itself it 

 gradually reassumed the normal position, lifted its head, and re- 

 mained still. If loosened from the manger and forced backwards it 

 pivoted on the hind legs. There was great difliculty in bringing it 

 out of the stable. At first it refused to walk, then it made a few steps, 

 but seemed about to fall. During these movements the head was 

 extended and carried towards the right. Circulation and respiration 

 were normal. 



A blister was applied to the vertebral column from the withers to 

 the tail ; cold douches to the back of the head were prescribed, and 

 sulphate of strychnine was given internally. 



The patient had great difficulty in walking from the station at 

 Maisons-Alfort to the College. Placed in a box it lay down on the 

 right side. Breathing was very rapid and difficult. Motor power 

 appeared to be preserved ; there were frequent movements of the neck 

 and limbs. Sensation was diminished : on pricking the skin in different 

 parts of the body no reaction resulted. Temperature 39'7° C. The 

 animal was assisted into a standing position and made a few uncertain 

 steps, but showed generalised trembling movements and soon fell. At 

 the end of a few hours the respirations were 64, the pulse 80 per minute. 

 The conjunctiva was cyanotic. Death occurred during the night. 



Autopsy. — No change could be detected in the thoracic or abdo- 

 minal viscera, or in the spinal cord and brain, nor did the exterior of 

 the cerebellum show anything abnormal. But on incising the latter 

 we found in the lower portion of the vermiform process, and right lobe 



