3 68 



GENERAL PRINCIPLES 



through the drinking water or blown in the dust upon the 

 food, these eggs find their way into the stomach of the rabbit. 



FIG. 232. Diagram of the life history of'the liver'fluke (Fasciola). A, Egg; 

 B, embryo; C, ciliated larva;*/), sporocyst; , sporocyst, later stage; F, mature 

 redia containing young rediae and cercariae; G, cercaria; H, same encysted. /, 

 young fluke; b, brain; b.p, birth pore; c, cercaria; c.m., cell masses which develop 

 into embryos; e, eye-spots; ex., excretory tubules; g, intestine; m, mouth; ph, 

 pharynx; r, redia; s, suckers; sc, sporocyst; +, stages at which non-sexual re- 

 production occurs; *, stage of sexual reproduction. (From Galloway after 

 Thomas, Leuckart, and others.) 



Here the larvae are set free and bore their way into the tissues 

 of the stomach, then get into the blood vessels and ultimately 



