52 The Farmer'' s Veterinary Adviser. 



oblong objects progressing over soil and vegetables by a 

 worm-like movement, and depositing an endless number 

 of microscopic eggs with, which they are literally filled. 

 Some tape-worms are estimated to lay as many as 25,000,- 

 000 eggs. Taken with the food or water into the body of 

 a suitable host these eggs open and set free an ovoid six- 

 liooked embryo, which bores its way through the tissues 

 until it reaches that organ or tissue which is the natural 

 habitat of its species in the young or larval state and there 

 encysts itself. It may survive indefinitely or even die in 

 this situation or if its host is eaten by a carnivorous ani- 

 mal it may develop in its bowels into a mature tape-worm 

 and reproduce its species as before. Fortunately nearly 

 all the eggs perish from failing to be taken into the body 

 of a suitable animal in which they can develop into the 

 cystic form, or this peril escaped, because the first animal 

 host is not devoured by the right species of animal in 

 which the young cystic worm can grow into its mature 

 tape-worm form. But from the enormous fecundity of 

 these tape-worms in eggs it is manifest that there may be 

 scarcely any limit to their increase when the different ani- 

 mals which form their hosts in the cystic and mature con- 

 dition abound together in the same locality. 



STAGGEBS. TURN-SICK. GID. STURDY. WATEE-BBAIN IN 

 LAMBS AND CALVES. 



The TcBiiia Goenurus of the bowels of the dog, a tape- 

 worm of one to three feet long, has its cystic form — Ccenu- 

 rvs Cerebralis — in the brain and spinal cord of sheep and 

 cattle, giving rise to nervous disease, varying much in 

 character according to the exact site of the cyst. 



Symptoms. Great nervousness and fear without appar- 

 ent cause, or dulhiess, stupor and aberration of the 

 senses, and disorderly muscular movements. The sheep 

 is found apart from the flock with red eyes, dilated pupils, 

 blindness and unsteady gait, but with a tendency to move 

 restlessly in one direction. Left to itself, it neglects to 



