208 ENTOZOA. 



CHAPTEE IV. 



CBSTODA. 



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

 great merit in establishing the experimental method of research — The inferences of 

 MM. Pouchet and Verrier successfully opposed by Van Beneden — Tcenia solium— 

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

 proglottis — Egg and six-hooked embryo — Measle or Cysticercus cellulostB. 



We now enter upon tlie consideration of ttose species of tlie great 

 Cestode group of lielmintlis -wMcli 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 poiat can 

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

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

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

 however, to those who threw most light upon the helminthological 

 obscm-ities of the past, I may remark that Dujardin, Bschricht, 

 and Yon 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 Ktichenmeister, 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 neuestem Entdeckungen iiber mensohliche Eingeweidewurmer und deren 

 Bedeutung fiir die Gesundheitspflege," s. 627. 



