74 DISEASES OF MUSCLES AND TENDONS. 



the cause of ^Moses and ^Mohammed having prohibited the consumption 

 of pork by their disciples. In the iiiddle 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 tfenife became well 

 known and the importance of the cystic phase clearly established. 



Fig. 30. — A piece of pork 

 heavily infected with pork 

 measles (Cijsficcrcus ccUii- 

 Zosffi), natural size. (StQes, 

 Report U.S.A. Bureau of 

 Agriculture, 1901.) 



Fiii. 31. — An isolated pork-naeasle bladder worm iCysticcrcus 

 celluloscE), with extended head, greatlj' enlarged. (Stiles, 

 licport 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 Ttciiia 

 fiolhnn. 



Young animals alone seem to contract the disease. After the ao'e of 

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



It is very rare in apimals reared in confinement, but is relatively 



