T.3ENIA S AGIN AT A 



245 



Artificial infections of human beings with Cysticercus bovis 

 to obtain the tapeworm were less nume- 

 rous and indeed quite superfluous, yet 

 this was also done by Oliver (1869) in 

 India, and Perroncito (1877) in Italy. The 

 experiments of the latter prove that the 

 extracted cysticerci of the ox certainly perish 

 in water at 47 48 C. 



It is a remarkable circumstance that, at least 

 as regards Central Europe, Cysticercus bovis in the 

 ox, after natural infection, was so seldom found, 

 that almost every case was published as a rarity ; 

 whereas the taenia is very frequent in man. The 

 reason for this is, that in Germany cattle are 

 not severely infected, and that the small, easily- 

 dried-up cysticerci easily escape notice in the large 

 body of the host. Hertwig, the late director of 

 the town cattle market in Berlin, in 1888, pointed 

 out that the cysticercus of the bx is found chiefly 

 in the musculi pteryogoidei externi and interni, 

 and since that time a far greater number of 

 infected oxen have been found in Berlin. 



Since 1892 an increase has taken place in the 

 number of oxen infected with cysticercus, but this 

 is probably attributable to the more general 



FIG. 169. A piece of 

 the muscle of the ox, with 

 three specimens of Cysti- 

 cercus bovis, natural size. 

 (After Ostertag.) 



and searching examinations. In the slaughter-houses of Prussia the number 

 of infected beasts was as follows : 



1892 



1894 



1895 

 1896 

 1897 



567 

 686 

 748 



i,i43 

 1,918 

 2,629 



The condition was most frequent in Neisse (3-2 4 per cent.), Eisenach (i'9i 

 per cent.), Ohlau (1*57 per cent.), Oels i. Schles (i per cent.), Marienwerder 

 (0-341-2 per cent.). The flesh of oxen only slightly infected (containing not 

 more than ten living cysticerci) is sold in pieces of not more than 5 Ibs. to 



