CESTODA 71 



that they could in no case survive at 47 C. and 48 C. when 

 they were maintained at this temperature at least five 

 minutes. But to the end of more fully corroborating the facts 

 I had thus communicated, I, contemporaneously with these, 

 made some breeding experiments with the same Cysticerci on 

 bold and courageous students who generously offered themselves 

 for the benefit of science. 



" Consequently I am now enabled to state that neither Mr 

 Gemelli nor Dr Ragni contracted the T&nia, though each of 

 them had eaten a Cysticercus of the Tania mediocanellata pre- 

 viously, and respectively subjected to a temperature of 45 C. 

 and 47 C. The larvas were properly prepared and submitted 

 to gradual heating on the above-mentioned table, and swallowed 

 when they no longer gave signs of life. In like manner no 

 generation of the Tcenia took place in the body of Mr Martini, 

 who ate the Cysticercus brought to a temperature of 44 C. It 

 was maintained at this degree of heat during a period of about 

 three minutes, and swallowed whilst a very slight movement 

 was still visible in a portion of its neck. 



"In another student, on the contrary, who ate a living Cys- 

 ticercus of the Taenia mediocanellata, the tapeworm reached its 

 maturation in fifty-four days and eliminated the two first pro- 

 glottides. It threw off two more on the fifty-eighth day, and 

 thirty on the sixtieth. Sixty- seven days after swallowing the 

 Cysticercus this courageous young man, having, like his three 

 companions, taken some kousso and castor oil, emitted the strobila. 

 It was furnished with 866 rings, but destitute of the neck and 

 head. Its measurement afforded a total length of 4'274 metres. 



" Adding now to the 866 proglottides the thirty-four already 

 eliminated, 900 would be the number of the segments ; and 

 reckoning the length of each of the latter to be fourteen milli- 

 metres, we should have had the strobila (deprived of the head 

 and neck) reaching a length of 4*75 metres. Further, calcu- 

 lating the head and neck to be eight millimetres long, a total 

 length of 4*83 metres would be the result. 



" From all these facts we may conclude that the Tania has, 

 in our instance, reached an approximative length of seventy-two 

 millimetres a day, affording a daily production of 13*43 pro- 

 glottides." 



In relation to requirements of state medicine I have 

 thought Perroncito's researches sufficiently valuable to be quoted 

 at some length ; but their chief interest culminates in the worm- 



