Syinptonis. G35 



for some unknown reason becomes rapid and involves the mem- 

 branes, or bursts into the ventricle. Cases in which the ab- 

 scess-formation occurs in the frontal lobes of the hemispheres 

 appear to take this slow course. 



In the great majority of cases wiiich run a less rapid course 

 symptoms of disease are to be observed for a longer time, and 

 particularly those of dullness or loss of consciousness. Forced 

 movements are seen with comparative frequency, the movement 

 in the majority of cases being in circles and more rarely in other 

 directions. 



In these cases there is a tendency for the symptoms of ex- 

 citement to make their appearance at variable intervals, the ani- 

 mals suffering from attacks of mania, alternating with severe 

 depression. There may also be epileptiform seizures during 

 the periods in which the animals appear to be in perfect health 

 (Lydtin, Trolldenier). Noack had a case of this sort under ob- 

 servation for three months. 



Sudden blindness is occasionally observed as a focal symp- 

 tom. In a case recorded by Bouchet in which there was an ab- 

 scess in the middle of the left hemisphere and fibrous basilar 

 meningitis, a foal went blind during the night. The right pupil 

 did not react to light at all, while the left reacted for some 

 time. There was total blindness of the right eye, but move- 

 ments with the hand in front of the left eye were appreciated 

 by the animal for some time. In a case recorded by Thierry, 

 in which there was an abscess in the right hemisphere, there 

 was sudden amaurosis of the left eye. No accurate tests were 

 made regarding the sight of the other eye. 



Unilateral paralysis was observed by Haase in a case in 

 which there was an abscess in one hemisphere directly under 

 the membranes. In a case recorded by Greiners a foal sweated 

 profusely after every meal for a period of four months. At 

 the postmortem an al)scess the size of a hazelnut was found in 

 the right half of the cere])ellum. Shortly before death the ani- 

 mal had shown respiration of the Cheyne-Stokes type. A pig 

 which had an abscess the size of a hazelnut in the right half of 

 the cerebellum staggered in its gait, walked in circles to the 

 right and fell on its right side in such a way that its snout 

 struck the ground first (Kertesz). In a case recorded by Haas 

 a cow was observed to carry its head to the left side owing to 

 the presence of an abscess the size of an apple in the left hem- 

 isphere. Any attempts to make the animal carry it straight 

 caused attacks of mania. A horse in which there was an ab- 

 scess in the posterior portion of the vermiform process of the 

 cerebellum showed giddiness and an uncertain gait, and fell fre- 

 quently (Jacoulet). 



In some of the less acute cases there is no elevation of tem- 

 perature, but it is probable that systematic testing would show 

 a rise in some cases. 



