DR. LEGEAR'S STOCK BOOK. 347 



sheep, around the nostrils, which is distasteful to the fly, and 

 death to the egg. Where the sheep are pasturing, always keep a 

 piece of ground well plowed and pulverized, so that they can go 

 at any time, when attacked by the gadflies, and bury their noses 

 in the soft earth, to protect themselves from the insect. 



STURDY, OE GID. 



Tins disease is not so common in America as it is in England, 

 probably from the fact that there are fewer dogs in proportion to 

 the population here than there. It is also known as turn-sick, 

 liydatid of the brain, etc. 



Cause. This dangerous disease is caused by the bladder worm 

 a form of tapeworm preceding the true or sexually perfect 

 worm which is developed from the tapeworm of the dog. This 

 parasite (coenurus cerebrahs), if given to the dog, will produce 

 a tapeworm, which, becoming fully developed, leaves the dog in 

 pieces (segments), each ripe piece containing a large number of 

 eggs. The eggs are picked up by the .sheep whilst grazing or 

 drinking. In the stomach its shell is dissolved, setting free the 

 minute parasites, which soon find their way to the brain; it be- 

 comes encysted (enclosed in a sac), and sets up a considerable 

 amount of irritation. The disease is apt to be more common 

 where dogs and sheep mix. The hydatid may attack any part of 

 the brain, but usually locates itself in the upper part of one of 

 the great lobes, or between them. 



Symptoms. The affected animal is found off by itself, walk- 

 ing in a circular manner, with the head carried to one side, if the 

 hydatid is located in one of the lobes of the brain; when it is 

 situated between them, the head is carried in an elevated posi- 

 tion. If the animal turns to the right, the hydatid will usually 

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