ENTOZOA. 



451 



ENTOZOA. 



In considering the creatures inhabiting the garden, the Entozoa 

 must always be mentioned, as they live one life on vegetation, a second 

 life in different animals, and a third life in man : therefore, the present 

 life in the garden may become the future life in our bodies, in the form 

 either of tapeworms in our intestines, of the Trichinia spiralis in our 

 muscles, of the Filaria in our eyes, or of the Hydatids in our brain. 



There is hardly a creature living in the garden which has not 

 its entozoa, and therefore I can only allude to the more important, 

 which are especially interesting to man himself. 



Dr. Cobbold, a great authority on entozoa, has pointed out that one 

 of the tapeworms which infest man, the Tcenia mediocanellata — known 

 also as the Beef Tapeworm, or Unarmed Tapeworm — is developed from 

 an egg. This egg (fig. looi) is passed by man to the grass, where it 

 is swallowed by. the cow. The egg, on passing into the stomach, has 

 the exterior case dissolved by the gastric juice, when by means of six 

 piercers it passes to the flesh of the cow, where it grows and lives and 



Fig. iooi. — Egg of 



Beef Tapeworm, 



magniiied. 



Fig. I002. — Beef Measles. Fig. 1003. — Beef Tapeworm, magnified, 



constitutes the so-called Measles (fig. 1002) ; a little sac in the flesh or 

 meat about the size of a hemp-seed, but more irregular in form. In this 

 sac the creature resides (fig. 1003), but is still immature, and 

 the flesh has to be eaten by man before it can be fully 

 perfected, when on passing into the stomach it becomes 

 the Beef Tapeworm (fig. 1004), having from a thousand 

 to twelve hundred joints. All the joints beyond 450 are 

 mature, and capable of producing eggs. Each mature joint 

 has been calculated to produce 4S,ooo eggs, and from a calculation 

 made on a joint in my cabinet 30,000 ova at least exist, which shows 

 the terrible fecundity of this tapeworm pest. 



G G 2 



Fig. 1004. — 



Head of Beef 



Tapeworm, 



magniiied. 



