26 



THE INTERNAL PAEASITES OE 



to infest themselves to the extent here artificially induced ; 

 consequently they are usually spared the inconveniences 

 resulting from the wanderings of any very considerable 

 number of these larvee in their interior. Swine, whose 

 habits are less cleanly, do not enjoy the same immunity, 

 for in them the measly condition may assume proportions 

 almost equal to anything of the same kind which, we have 



Fig. 7. Hind Quarters of a Calf showing Measles. 



experimentally produced in cattle. On the other hand, 

 swine will undergo a large amount of parasitism without 

 displaying those external evidences of suffering which 

 other animals are apt to betray under similar circum- 

 stances. Thus we see how it happens that measly beef 



