336 THE DEVELOPMENT OF CESTODES. 



This experiment of Kiichenmeister did not long remain alone. 

 Even before it was published I had made a similar experiment with 

 the eggs of the tape-worm of the cat {T. crassicollis). I fed a number 

 of mice with these eggs, and was able very soon after Kiichenmeister 

 to report ^ that five of the six mice experimented on were found to 

 have their livers infested with bladder-worms {Cysticenus fasciolaris), 

 while those not fed remained perfectly healthy. 



The important results of the experimental method became still 

 more evident when Haubner and Kiichenmeister, working with 

 abundant material at the expense of the Government of Saxony, 

 proved that they could, in the above described way, produce the 

 familiar forms of bladder-worm at will and in the greatest abun- 

 dance. ^ And it was always only the "dropsically degenerated" 

 bladder-worms which grew into mature tape-worms when transferred 

 by feeding to other suitable hosts. 



'Not were such experiments confined to Saxony under Kiichen- 

 meister's eyes, but had equally successful results in Berhn, Louvain, 

 Copenhagen, Giessen, Vienna, and afterwards also in Toulouse, Alfort, 

 London, &o. Specially convincing was the result of a "feeding" 

 experiment made simultaneously with some of Kiichenmeister's 

 material (Tcenia ccenurus) by van Beneden in Louvain, Eschricht ia 

 Copenhagen, and by me in Giessen, in all which the animals under 

 experiment (lambs) became pathologically affected with exactly 

 identical phenomena.^ 



After these abundant and harmonious results, the migrations and 

 metamorphosis of the six-hooked tape-worm embryos could no longer 

 be regarded as abnormal. 



But the task of scientific investigation was not yet ended. It was 

 still necessary to follow the gradual development of the bladder- 

 worm from the embryo, and to demonstrate the ways and means by 

 which the latter reached the host, and the organ in which it was to 

 undergo its further development. And in this connection I think I 

 may claim some share in advancing our knowledge of the Cestode 

 development, and that through numerous methodical feeding experi- 

 ments.* 



But before I shortly summarise these results, I must glance at the 



* dotting, gel. Anzeigen, No. 66, 1864 (report on Ktichenmeister'a work on Cestodes) ; 

 Gurlt's Mag. f. ThierarzneiJcunde, p. 263, 1854. 



^ Gurlt's Mag., p. 243, 1854 (Ccenurus), p. 367 {Oysticercus pisiformis, C. tenuicolUs, 

 Ccenurus), p. 100, 1865 (C. cdlulosce, Ccenurus). 

 ' Gurlt's Mag., p. 604, 1854. 



* " Amtlicher Berioht der Gottinger Naturf.-Versammlung," p. 89, 1854; Ann. 

 Sci. Nat, t. iii., p. 361, 1855 ; " Die Blasenwurmer und ihre Entwiokelung," p. 74 et seq. 

 1856. 



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