368 



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; D, sporocyst; E, sporocyst, later stage; /*', mature 

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

 young fluke; b, brain; b.p, birth pore; c, cercaria; cm., 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 larva; are set free and bore their way into the tissues 

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



