3o6 



CLINICAL VETERINARY MEDICINE AND SURGERY. 



the animal seemed weak in its hind quarters, and threatened to fall if 

 urged beyond a slow walk. 



State on Examination. — Pulse 36, respiration 16, temperature ioo-i-° F. 

 The neck was turned to the right side, it rotated on the head, and 

 the chin was directed towards the middle line. Slight paralysis of 

 muscles of right side ; lip and nose turned towards the right ; right 

 nostril more dilated than left, especially when horse was excited. The 

 skin of right nostril was more sensitive to pin pricks than that of 

 left. The right eye was turned downwards, inwards, and forwards, 

 was sensitive to light, and the fundus appeared normal. The left was 

 turned upwards and outwards, the cornea appeared unduly convex 

 and the whole eye prominent, the pupil was widely dilated, the retina 

 was insensitive to light, the eye was immoveable and did not follow 

 the light, and the membrana nictitans projected some distance over it. 

 There was slight ptosis. The eyes were held in asymmetrical posi- 

 tions ; the right seemed less under control than the left. Slight noises 



Fig. 24. — Brain seen from left side. Cerebellar tumour shown lighter shaded. 



seemed more alarming on left than on right side. The left ear was 

 moved freely. 



The hind limbs were moved with difficulty, the toes dragging along 

 the ground; when turning the horse almost fell down. Noises, etc., 

 especially on the left side, greatly aggravated the symptoms. The neck 

 was then jerked away to the right, the head twisted on the neck until 

 its sides were almost horizontal, the squinting increased, and the animal 

 staggered, lifted and put down its feet spasmodically, and seemed about 

 to fall. 



Diagnosis. — Brain lesion. On account of sudden onset and extensive 

 area involved is apparently due to haemorrhage ; the symptoms shown 

 point to injury in the fourth ventricle, slightly to one side of middle 

 line and almost directly over corpora quadrigemina. 



Improvement was slow, and owing to the uncertainty of cure the 

 animal was destroyed by intra-tracheal injection of one ounce of prussic 

 acid. Death only occurred after seven or eight minutes. 



Autopsy showed no important lesions in the thorax or abdomen. 



