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 taeniae became well 

 known and the importance of the cystic phase clearly established. 



ric )0— \ piece ot poik 

 heiMh infected with, poik 

 me isles {Cysticncus idUi 

 losa) wxiwixX ^i/e. (Stiles 

 Kepoit L S \ Buiciu of 

 Voucnltuic 1901 ) 



Fig. 31. — An isolated pork-measle bladder woiiu (Ci/sticcrcus 

 ceUulos(c), with extended head, greatly enlarged. (Stiles, 

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



Causation. The cause of cysticercus disease in the pig ma}' be 

 summed up in one phrase — viz., ingestion of eggs or eml)ryos of T<enia 

 soUnm. 



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 



