PARASITES OF SWINE. 



975 



segments is introduced into the stomach of a pig, the process of di- 

 gestion sets the eggs at liberty, and from each an embryo issues, 

 armed in such a way that it can bore into the tissues, as a mole bur- 



Fig. 1304.— Segment of Taenia. 



rows into the soil. Or if an egg is swallowed by a man, it is hatched 

 in his stomach in precisely the same manner. 



Figs. 1305 and 1306 show the parasite in different stages of de- 

 velopment. 



The cysticercus of the pig becomes a taenia when introduced 

 into man, with as much certainty as the seed of a beet becomes a 

 beet when sown in the earth- Hence the danger in eating measly 

 pork. In this disease the cysts, about the size of a grain of barley, 



are scattered through the 

 muscles and other tissue's 

 of the pig, where they are 

 beyond the reach of med- 

 icine. The flesh thus in- 

 fested presents the ap- 

 pearance shown irt Fig. 

 1307. The presence of 

 these cysjs in the hog niay 

 sometimes be detected in 

 the eye, or Under the 

 tongue. The symptoms 

 of the disease are a cough, 

 running from the eyes, 

 discharge from the nose, 

 and weakness of the hind 

 legs, with general debility. 

 When once encysted, the 

 cysts cause no further annoyance to the animal. Small doses of 

 saltpeter and sulphur may be given daily for several weeks. 



Fig. 1305.— Cysticercus Cellulosus. 



1, Cyst (natural size) laid open to show the cystl- 

 •ercus; 2, Body (enlarged), coming out of the reside; 

 S, Cysticercus inclosed in the vesicle; 4, Vesicle opened 

 to (how the sac covering the body; 5, The cysticercus 

 emerging; 6, Same enlarged, showing the head. 



