238 



SWINE PRACTICE 



digestive juices dissolve the shell of the tapeworm ovum and liberate 

 a six-hooked embryo. The embryos bore through the walls of the 

 stomach, some of them entering the blood vessels, and are thus dis- 

 tributed by migration and the circulation of the blood to all parts of 

 the body. Those deposited elsewhere than in the muscular tissue 

 do not as a rule develop. The development of the parasite is rather 

 slow. The embryo assumes the form of a cyst and in twenty days' 



Pig. 51. Section of a measly hog heart. (Ostertag.) 



time is about the size of an ordinary pinhead. By this time the head 

 of the future tapeworm is visible as a mere point. About two months 

 after the embryo lodges in the muscle it has attained the size of a 

 small pea, and in three months the embryo has matured, as is evi- 

 denced by the presence of sucker disks and a rostellum of booklets 

 on the head of the future tapeworm. Should a human being con- 

 sume uncooked swine flesh containing one of these mature bladder 

 worms the digestive juices would dissolve the capsule and liberate 

 the scolex which would attach itself to the intestinal mucosa. From 



