352 



THE ANIMAL PARASITES OF MAN 



(4) Further, a fourth method of formation of daughter cysts is 

 described by Naunyn as occurring in sterile hydatids, i.e., those con- 

 taining no brood capsules. In this case a portion of the mother wall 

 of the hydatid gets constricted off. 



FIG. 257. 



FIGS. 257 and 257A. Diagram of transformation of a scolex into a daughter cyst (i to 3) : 

 I, scolex in brood capsule ; 2, liquefaction of scolex ; 3, daughter cyst ; and (4 to 6) of a broou 

 capsule into a daughter cyst : 4, brood capsule with scolex ; 5, deposition of new epithelial 

 layers on the inner layer of the parenchyma ; 0, disappearance of outer parenchyma and formation 

 of inner parenchyma from the parenchyma of scolex, which has now disappeared. (Note. 

 The scolices are out of proportion to the brood capsules and to the daughter cysts. (Stephens.) 



It has also been established that not only daughter cysts transplanted 

 into animals develop further (Lebedeff, Andrejew, Stadnitzky, Alexinsky, 

 Riemann), but that this also holds good if only hydatid scolices from 



