DIZZINESS, STAGGERS, STURDY, <feo. 235 



the median line, in which case it may turn to either 

 side, or not at all, the animal carrying the head down. 

 When the hydatid occupies the back of the head, the 

 animal holds the head high, and runs straight for- 

 ward, throwing itself on any object it meets. 



SYMPTOMS. As above indicated, the symptoms con- 

 sist of various forms of turning, whirling around or 

 standing still, etc. At first, when the hydatids are 

 small there may be but little or nothing to indicate their 

 presence ; but as they grow larger, they press upon 

 the bone and even enlarge or remove a great portion 

 of it. One side of the head may be enormously en- 

 larged, or the bone become quite thin so that the 

 situation of the cyst may be thus known, and some- 

 times a small hole may be discerned. The sacks 

 are more frequently on the left side. 



The first effects are dullness, loss of spirits ; they 

 chew the cud slowly and carelessly ; they keep aloof 

 from the other sheep ; they stagger when walking ; 

 stand before a pool of water looking into it, and 

 sometimes tumble in and are drowned ; sometimes 

 when eating they appear as if frightened, and run 

 over the field as if pursued ; the head is held higher 

 or lower or carried on one side ; the body in moving 

 inclines to the same side ; the eyes have a peculiar 

 bluish color ; the sheep appear to wander about, 

 and gradually loose flesh and strength ; then they 

 begin to turn round and round to one side ; seem 

 quite unconscious of every thing around them ; the 

 round and round movements increase until they are 

 almost constant, and the animal at length dies. 



