Parasites. 57 



5), is tlie immature form of a tape-worm of man, (Tcunia 

 solium), and is only caused by pigs having access to hu- 



Fig. 5. 



Fig. 5 — Cysticercus Cellulosa, magnified. 



man excrement, or to places near privies, etc., from wliicli 

 the segments of the human tape-worm may travel. The 

 cysts, respectively about the size of a grain of barley, are 

 found in the muscles, in the loose connective tissue be- 

 tween them and under the skin, in the serous membranes, 

 in the eye, under the tongue, in the brain, etc., of swine. 

 They are also found in this undeveloped form in the mus- 

 cles, brain, etc., of man, causing disease and death. To 

 man the parasite is usually conveyed by eating under- 

 done pork, or in the cystic form he receives it as the 

 egg in his food (salads, etc.,) and water. 



Symptoms. In pigs the cysts can usually be seen under 

 the tongue or in the eye. In man there are the general 

 symptoms of intestinal worms and the passage of the ripe 

 segments. Other symptoms may attend the presence of 

 the cysts according to the organ which they invade. Thus 

 when passing into the muscles there are pains and stiffness 

 resembling rheumatism, when into the brain, coma, stupor, 

 imbecility, delirium, but when they have once become en- 

 cysted they may continue thus indefinitely without further 

 injury. 



Treatment. The cysts scattered through the body are 

 beyond the reach of medicine. 



Prevention. Human beings harboring tape-worms should 

 be compelled to take measures to expel them. Their stools 

 should be burned or treated with strong mineral acids. 

 Swine should be kept far apart from all deposits of human 

 excrement ; no such manure should be used as a top-dress- 



