492 HISTORY OF CYSTICEECUS CELLULOSE. 



bladder in the form of an opaque spot. In the third pig, killed sixty 

 days after the first and forty-one days after the last feeding, such a 

 large number of bladder-worms were found, that a single half ounce 

 of flesh contained 150. The largest were almost mature as regards 

 size, form, and the development of the head, while the smallest were 

 like the largest ones in the second pig. 



An experiment made by me at almost the same time afforded 

 exactly the same result. There were also five pigs, most of which I 

 fed several times with tape-worm (expelled by various anthelminthics, 

 and especially by cousso and pomegranate bark). I examined the pigs 

 at varying intervals after the commencement of the experiment.^ 



In one case a dissection was made of the animal forty and thirty- 

 two days after the first and last feedings respectively. The bladder- 

 worms were extremely numerous, from 1 mm. to 5 mm. in length, and 

 the largest were already oblong in form. They were found chiefly in 

 the muscles of the belly, breast, and neck, also in the diaphragm, and a 

 few in the brain and liver. The parenchyma of the lungs contained a 

 number of small white cysts, probably representing a brood which 

 had found ingress, but had not become further developed. The head- 

 process was distinctly visible in all of them, but was generally small, 

 and, even in the largest bladder-worms, still without any trace of 

 suckers and hooks. And if it were d priori probable that the bladder- 

 worms originated from the administered tape-worm, this was estab- 

 lished beyond all doubt by the fact that a muscle extracted from the 

 pig ten days after feeding contained as yet no bladder-worms. 



The sterno-hyoid muscle of a second pig, fed in the same way, 

 exhibited, after forty-two days, bladder-worms of the same stage of 

 development as the above case, but surprisingly smaller, although the 

 animal was fed with equal portions and belonged to the same litter. 

 The dissection was not made until 124 days after the feeding, the 

 animal having twenty days previously eaten a second tape-worm. The 

 bladder- worms had meanwhile attained a length of 12 mm., and a 

 breadth of 5'5 mm. They were fully developed, having a head-process 

 3 mm. long. In number they amounted to some hundreds, while in 

 the first pig there would be, perhaps, as many thousands. 



The majority of them were found in the muscles of the breast and 

 neck, and also in the brain ; but in the latter situation the parasites, 

 although fully developed, hardly measured more than 5 to 6 mm. 

 The last feeding seemed to have been almost without results. Only 

 in the brain some small bladder-worms were found of 1'5 to 2 mm. in 

 length, and with a newly formed rudimentary head. 



^ Two of these experiments have already been mentioned in my treatise, "Blasen- 

 bandwiirmer," p. 48, 1856.^. ... ,, .,. „^ 



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