208 ENTOZOA. 



CHAPTER IV. 



OESTODA. 



General considerations respecting the origin of human tapeworms — Kiiclienmeister's 

 gi'eat merit in establishing the experimental method of research — The inferences of 

 MM. Ponchet and Yerrier successfully opposed by Yan Beneden — Tcenia solium — 

 General and specific characters — Name and history — Anatomy of the strobile and 

 proglottis — Egg and siK-hooked embryo — Measle or Cysticercus celluloses. 



We now enter upon the consideration of those species of the great 

 Oestode group of hehninths which are liable to infest the human 

 frame ; and here it is that we encounter a series of strangely con- 

 stituted beings, whose development in our bodies is fraught with 

 the most disastrous consequences to health and life. Into the his- 

 torical part of our subject I do not care to enter at any length, but 

 those who are minded to acquaint themselves on this point can 

 easily do so by procuring a copy of the " Conversations Jahrbiicher" 

 for 1863, in which they will find Leuckart's admirable resume of 

 aU the principal data bearing on this curious subject.* In justice, 

 however, to those who threw most light upon the helminthological 

 obscurities of the past, I may remark that Dujardin, Eschricht, 

 and Von Siebold were the first to show that the cystic worms 

 (hydatids, acephalocysts, etc.) were only phases in the life- 

 development of the cestoda or tapeworms ; but the greatest merit 

 is undoubtedly due to Kllchenmeister, who founded the experimen- 

 tal method of demonstrating these relations. As Leuckart remarks, 

 it was Kiichenmeister who first " hit upon the idea of administering 



* "Die nenestcrn Entdeckungen iiber menschliche Eingeweidewiirmer und deren 

 Bedentung fiir die Gcsundhcitspflcge," s. 627. 



