124 ANIMAL PARASITES. 



preparation of fruits, herbs, and roots which are to be eaten raw, 

 and that everyone who harbours a Tcenia solium should get it ex- 

 pelled as soon as possible, are the only preventive means that 

 we know of. Should some experiments which I am now institu- 

 ting lead to any result, I will give them to the readers of this 

 work in an appendix. As we are writing a text-book of the 

 diagnosis and treatment of the parasites of the human body, the 

 occurrence of Cysticercus cellulosae in man concerns us particularly, 

 and although the Cysticercus celluloses belongs to the section of 

 immature Cestoidea, in order to a^oid separating what is inti- 

 mately connected by too great a space, we shall add here what we 

 have to say 



Upon the occurrence of the Scolex of Tsenia solium = Cysticercus 

 cellulosse, in the human body. 



The Cysticercus celluloses has hitherto been found in the most 

 various parts of the most various muscles, especially in the mus- 

 cles of the hearty in the cellular tissue, in the brain, and in the 

 eye of man. 



In all these regions of the body it acquires various forms and 

 sizes, according to the space which is afforded for its development ; 

 and in the ventricles of the brain and the eye especially its caudal 

 vesicle attains even the size of a walnut, and the most remark- 

 able forms. Von Siebold, speaking of the production of these 

 remarkable forms in the vesicle of the Cysticerci, says (p. 64) 

 " the excess of nourishment will give rise to exuberant growths 

 and degeneration of the body of the embryo;" and he then 

 treats (p. 68, and in figs. 27, 28) very diffusely of this very simple 

 process, which may be summed up in the following few words so 

 that every one may understand it. It is not only the excess of 

 nourishment that, in the first place, determines the size and form 

 of the Cysticerci, but rather the softness, yielding nature, and 

 looseness of the tissues in which the Cysticercus occurs. Wherever 

 a vacant space or a yielding spot occurs, the cystic worm, in its 

 endeavours to increase in size, penetrates, and this may give it 

 and its cyst a hernia-like appearance. With these forms, how- 

 ever, we have little or nothing to do ; the nature of the worm 

 remains the same. 



According to the various positions occupied by the worm, the 



