CESTODA 60 



dipped afterwards in the above-mentioned tinctures, it colors 

 intensely in less than 45, beginning from the head, and onwards 

 to the extremity of the cyst of the tail. The head colors 

 more intensely and rapidly than the neck, as it is covered with 

 very numerous calcareous corpuscles, which are not met with 

 so frequently in the remaining part of the body. 



fc Cysticercus celluloses of the pig, and that of the Tcenia 

 mediocanellata of the calf, brought gradually to a final tem- 

 perature, the first of 50 C., and the second of 44, 45, and 47 

 C., and then swallowed alone, or with a piece of butter or 

 crumb of bread, never produced the Tania in the valiant 

 students who voluntarily undertook to make the experiment of 

 swallowing them. 



" My investigations were extended to other kinds and forms 

 of Helminths, and the results were always the same, so that, 

 abiding by the same principles, I was able to ascertain that 



" 1 st. The Cysticercus cellulose of the pig dies sometimes at 

 45 C., more frequently at 47 C., ordinarily at 48 C., very 

 seldom reaches alive 49 C., and is quite an exception when it 

 resists for a few moments the temperature of 50 C., so that we 

 can say that the Cysticercus brought gradually up to this tem- 

 perature most assuredly dies if it is kept there longer than one 

 minute. 



"2nd. A Cysticercus cellulose, extracted by Professor Ray- 

 mond from the conjunctiva of a child's eye, died between 45 

 and 46 C. 



"3rd. The Cysticercus of the Taenia mediocanellata dies 

 sometimes at 44 C., very often at 45 C., and does not resist a 

 temperature superior to 46 C. 



"4th. The Cysticercus pisiformis of the rabbit, like the 

 celluloses, dies sometimes at 45 and 46 C., but generally stands 

 still and perishes at 47 and 48 C. 



"5th. A Cysticercus tenuicollis died at 49 C. 



" 6th. The scolici of the Ccenurus cerebralis of a sheep died at 

 42 C. 



" 7th. The scolices of the cysts of Echinococcus polymorphus 

 die generally between 47 and 48 C., and in no case amongst 

 those I have experimented on did it reach 50 C. alive. 



" 8th. The Taenia cucumerina died, one at 43 C., and a 

 second parasite at 45 C. 



" 9th. A few individuals of Tania serrata of the dog died at 

 50 C. 



