Symptoms. 



667 



Animals sometimes move in circles, first in one direction, and 

 then in the other. This, according to Diem, is seen particular- 

 ly early in Simmenthal cattle. As the disturbances of con- 

 sciousness become more marked, there is developed a condition 

 resembling staggers. This stage is especially marked in young 

 animals in whi'ch the symptoms are striking, but in older ani- 

 mals, it often escapes observation. 



The second stage sets in in from three to six months (Pfab) 

 but it is not sharply marked off. The symptoms presented 

 closely resemble those observed in the sheep. Many affected 

 animals cannot find their places in the shed, especially if this 

 lies in the opposite direction to that in Avhich they tend to move 



Fig. 95. Lateral llexioii of tlie head in gid. 



when at pasture (Cruzel). It is very difficult to turn affected 

 animals or move them backwards; they cannot see objects m 

 their way and fall over them (G. Lovy). In one case recorded 

 by Trinchera, in which there was a hydatid in_ the neighbor- 

 hood of the corpora quadrigemina on the right side as large as 

 a hen's egg, there was in addition to movements in circles, par- 

 tial paralysis and atrophy of the limbs of that side. 



Eder is inclined to refer the paralysis of the fore-limb seen 

 in a calf affected with staggers to the presence of the cyst in 

 the brain. Simultaneous with the movement m circles, there 

 is a tendency to hold that side of the head which is turned 



