452 



MY CARD EX. 



Another Tapeworm, the Armed Tapeworm (Tcenia solium, fig, 1005), 

 produces eggs which when devoured by swine give rise to measly pork 

 (ficr. 1006). When this is eaten by man a perfect tapeworm arises, which 

 again passes eggs, to be again eaten by swine. If the eggs are taken 

 into the stomach of man, they give rise to Cysticerci (fig. 1007), or 

 measles, and if they travel to the brain they may cause fatal results. 



The tapeworm of the dog lives in man as the EcJdnococcus, or 

 Hydatid tapeworm (fig. 1008). All the figures are from Cobbold. 



FIG. 1005. Head 



of Taenia solium, 



magnified. 



FIG. 1006. Pork Measles, nat. size. 



aa t the cysts ; bb, tapeworm 



larvse. 



FIG. 1008. Hydatid 

 Tapeworm, mag- 

 nified. 



FIG. 1007. Cysticercus cellulosus, 

 magnified. 



The curious story of the tapeworms teaches us to eschew badly 

 cooked meat, and also to be careful that our animals do not eat the 

 eggs of the future tapeworms with their vegetal food. Dr. Cobbold 

 has pointed out the danger of allowing cattle to graze on sewage 

 grounds, where the eggs of tapeworms must of necessity be distributed. 

 I believe myself, from all I can learn (though up to this day I have 

 been unable to verify the fact as a matter of legal evidence), that 

 many beasts, and most sheep, become diseased on the sewage-grounds. 



Nevertheless I hear that one ox was fed upon 

 the produce of the Romford sewage-grounds, 

 and when killed was found healthy. Upon 

 our present information we ought to beware 

 of sewage-fed cattle, if we desire to avoid 

 future tapeworms. 



The outside life of many of the entozoa 

 is unknown : that of the Threadworm is of 



FIG. IOOQ. Hairworm. .1 i 



this class. 

 In all our streams we have a curious worm, called the Gordius 



