HELMINTHOLOGY HELMINTHES CYSTICI. 493 



filled with one or more cysts containing young hydatids. 

 In the uiother-cyst of the last species, small and transparent 

 vesicles are developed, which are gradually rendered opaque 

 by the young produced in their interior. With respect to 

 Echinococcus we again learn the most incredible things from 

 Klencke (Ueber die Contag. d. Eingeweid. pp. 14, 83 et 

 seq. ; vid. also Klencke' s previous communications with 

 reference to my experiments on the transmission of hyda- 

 tids as " Coutagium animatum," in Haeser's Archiv, 1843, 

 p. 226), which also must excite our wonder how it is that 

 Klencke has had such an extraordinary amount of experi- 

 ence with regard to the Echinococcus hominis. The cheesy 

 substance which is frequently present in the aqueous con- 

 tents of the Acephalocysts, is explained by Klencke to be 

 the ovary of these Cyst-worms ; in whose walls he has also 

 perceived oral orifices and intestinal tubes. Ova are said 

 to be contained in the Echinococcus progeny, which Klencke 

 has frequently seen attached in masses to the circlet of 

 hooks. From these masses of ova, cysts are said to be 

 formed, from which Acephalocysts originate, so that it 

 follows that these cysts are nothing else than encysted 

 ovaries of the Echinococcus. He has also found the ova 

 of Echinococcus both in the human blood and in cow's milk. 

 The experiments of transplantation of the Echinococcus into 

 other animals, in which experiments these supposed ova and 

 ovaries were sometimes injected, sometimes inoculated, were 

 again completely successful in the wonderfully fortunate 

 hands of Klencke. It is to be hoped that Klencke will 

 desist from these researches, which he has, in a short time, 

 so completely exhausted, and the results of which have 

 advanced to such an extraordinary extent our present 

 possible knowledge, and relinquish a field, the praiseworthy 

 and careful cultivation of which by other naturalists, though 

 but slow, will be attended with more permanent results. 



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