60 THE INTERNAL PARASITES OE 



more of such interesting cases have not been published. 

 As in sheep so in cattle,, one of the most striking symptoms 

 is the peculiar rotatory movement of the affected beast. 

 Staggering, vertigo, sudden starting, inability to straighten 

 the neck, difficulty of grazing, and subsequent impair- 

 ment of vision are amongst the other characteristic 

 phenomena of the disease. Cases are not wanting, how- 

 ever, in which a similiarity of symptoms may occur from 

 other agents that are capable of producing symptoms of 

 chronic compression of the brain. 



As early as the year 1 661 the parasitic nature of sturdy 

 was recognised; for, according to Youatt, Bartholin relates 

 that in the year in question a ' ' great many beasts perished 

 from a species of frenzy, and that when they were 

 examined vesicular worms were found in the substance 

 of the brain/'' Occurring rather more than a century 

 later (1792), I find an interesting paper by Moorcroft (in 

 the third volume of a serial entitled " Medical Facts and 

 Observations ") concerning the production of " hydatids 

 in the right anterior ventricles of the brain of a cow ; " 

 and during the present century many such like cases 

 have been published, especially in France. The instances 

 recorded, however, bear no proportion to the number of 

 cases which have been observed. 



Reserving my special account of the peculiarities pre- 

 sented by the entozoon itself, I have in this place further 

 to remark that amongst the more interesting cases on 

 record are two by Duplene. In the case of a two-year-old 

 heifer (and without being able to diagnose the precise 

 seat of the hydatid) he operated with perfect success, 

 saving the animal's life at a time when it was well-nigh 

 moribund ; and in the second case, that of a sturdied 

 bull, the operation for removing the parasite was also 



