CESTOIDEA. 23 



The rings are frequently detached, 

 and hve for a certain period in a free 

 state. 



This worm exists in the human 

 intestine, and very frequently only 

 one exists in the same individual, 

 from which circumstance the designa- 

 tion " Solium" was apphed to it by 

 Linnaeus. 



Most writers admit that, according to the analogy 

 between the form and arrangement of the heads of 

 the taenia solium and of the cysticercas cellulosae, and 

 according to the experiments of Klichenmeister, 

 Van Beneden, and others, the cysticercns cellulosae is 

 the larval state of the taenia solium.'^ 



These experiments have been conducted in two 

 ways : one by the ingestion of cysticerci into the 



^ Explanation of Figure 4. — The head of the Taenia Armata, 

 magnified twelve times, and shown in two different positions. 

 For the representation of the Taenia Solium Armata, see Fig. 13. 



^ It should be observed here that Dr. Davaine agrees with the 

 minority that this point has not yet been settled beyond all 

 doubts, owing to the small number of experiments which have 

 been made, to their failure in some instances, and to the numerous 

 sources of fallacy (already referred to) to which the experimenters 

 were naturally exposed. 



Other arguments in favour of the identity of the scolex of 

 the cysticercus cellulosae and that of the taenia solium, have been 

 sought for in the frequency of this species of taenia in Abyssinia, 

 where raw flesh is eaten, and at St. Petersburgh amongst those 

 young children who are nourished with raw beef. But (as 

 Dr. Davaine remarks) the flesh which is eaten iu Abyssinia, as 

 well as at St. Petersburgh, is beef and not pork, and it is only in 

 the latter that cysticerci are observed, so that this argument falls 

 to the ground, as it is based upon the supposition that the taenia 

 solium is largely propagated through the employment, as an 

 article of diet, of raw flesh containing cysticerci. 



