74 



DISEASES OF MUSCLES AND TENDONS. 



the cause of Moses and Mohammed having prohibited the consumption 

 of pork by their disciples. In the Middle Ages it formed the subject of 

 legislation. It was, however, only when the investigations of Van Beneden 

 and Kuchenmeister had completed those of the zoologists of the seven- 

 teenth and eighteenth centuries that the evolution of tsenii^ became well 

 known and the importance of the cystic phase clearly established. 



Tig 30. — A piece of pork 

 heavily infected with pork 

 measles {Cysticercus cellu- 

 \(e), natural size. (Stiles, 

 Keport U.S.A. Bureau of 

 Agiiculture, 1901.) 



Fig. 31. — An isolated pork-measle bladder worm {Cysticercus 

 cellulosce), with extended head, greatly enlarged. (Stiles, 

 Report U.S.A. Bureau of Agriculture, 1901.) 



Causation. The cause of cysticercus disease in the pig may be 

 summed up in one phrase — viz., ingestion of eggs or embryos of Tcenia 

 solium. 



Young animals alone seem to contract the disease. After the age of 

 eight to ten months they appear almost entirely proof against it. 



It is very rare in animals reared in confinement^ but is relatively 



