51 



segments of the T. mediocanellata, from which they 

 obtained scolices without hooks, precisely resembling 

 the head of the parent form, decided the question 

 in the negative. As I have not the detailed experi- 

 ments of the German observers at hand, I must refer 

 to those of Dr. Cobbold, which I give from his work 

 on Tapeworms : 



" It may interest the reader to explain briefly the 

 nature and circumstances attending one of our ex- 

 periments. In the case of the calf, I procured a 

 quantity of the ripe or sexually mature segments 

 of the unarmed tapeworm. These were immersed 

 in warm milk, and introduced by the mouth. Six- 

 teen days after the worm-feeding, some symptoms 

 of infection showed themselves ; but, in a few days 

 more, they entirely subsided. A second administra- 

 tion of the worm segments was therefore decided on. 

 Again, fifteen days after the second feeding, fresh 

 symptoms of irritability supervened ; and, for a few 

 days, the distress of the animal seemed to forebode 

 the likelihood of a fatal result. However, after a 

 while, its condition improved : the general expression 

 of the face indicated returning health, the breathing 

 and pulse improved, the tremors subsided, and the 

 appetite returned. Convalescence being perfectly es- 

 tablished, the animal quickly gained flesh, and, in two 

 months' time, might have been sold to a butcher as a 

 perfectly healthy and well-nourished animal. In truth, 

 it was healthy ; only, as we shall presently see, its 

 body was full of parasites, resulting from the worm- 

 feeding. About three months after the date of the 



