64 FEEDING WITH CYSTICERCUS TENUICOLLIS. 



end which gave them the appearance of tape- worms. The length 

 of these tape- worms varied with the difference of age from four 

 lines to an inch and three quarters. The shortest individuals 

 evidently proceeded from thos scolices which had been only 

 seventeen days in the small intestine of the dog. 



In the individuals of four lines long one could trace very close 

 transverse wrinkles gradually appearing behind the neck, always 

 more closely defined towards the posterior part, and denoting, 

 where they became wider apart, the future joints of this portion 

 of the body. The individuals of eight lines long, already 

 possessed a clearly jointed hinder end, the joints increasing 

 in number with the length of the individual. In all the indi- 

 viduals the scar I have mentioned was to be seen on the hinder 

 extremity of the body, or on its last joint. This last joint with 

 the scar, moreover, always appeared smaller and more slender 

 than the preceding ones, from which it follows that it is in that 

 part of the scolex which is situated between the posterior end 

 and the neck that the growth and articulation of the tape- worm 

 takes place. The sexual apparatus was not perceptible either in 

 the interior or on the exterior of the joints of these tape-worms 

 of from seventeen to twenty-three days old. 



Fifth experiment. On the 19th July, eight Cysticerci were 

 given to a sporting dog, and on the following day six-and-twenty, 

 to which were added four more on the 22d ; so that within four 

 days this dog had devoured altogether eight-and-thirty Cysticerci 

 tertuicolles. The small intestine of this dog, which was inspected 

 on the 20th August, afforded thirty-two Teenies in very different 

 stages of development. In regard to their length, a great differ- 

 ence already prevailed; in the smallest individuals the diameter 

 varied from four lines and a half to one inch and a half, whilst 

 the longest extended from five to ten and a half inches. The 

 consequence of this was that although from nine-and-twenty to 

 two-and- thirty days had elapsed since the Cysticerci had been 

 administered, their scolices had most unequally developed, some 

 of them being greatly behindhand in 'point of growth. I ob- 

 served the same thing in several other experiments. The reason 

 of this unequal development of the tape-worms may lie partly 

 in the different individuality of the Cysticerci, partly in that 

 of the dogs fed with them. In the longest individuals that I 

 obtained from this experiment the development of the joints was, 

 moreover,, most advanced; although these joints were always 



