PARASITES OF ANIMALS. 89 
cles, were visible to the naked eye. On the thirty-eighth day, 
the eminences appeared more distinctly on the surface, and 
the heads exhibited signs of their suckers and hooks. 
Toward the forty-fifth day the Cwnuri were of the size of a 
bean, and the cavities in which the heads are lodged were 
formed.” Encysted vesicles, containing strayed and aborted 
worms, were also found in the heart, the diaphragm, and the 
cesophagus. Some of the “ water-brains” obtained in this ex- 
periment were given to a dog early in March, and in due time 
a good crop of the mature tape-worm (Tenia cenurus) was 
obtained by killing the dog, which was done May 24th. These 
were immersed in white of eggs, in which some of them were 
kept alive, by changing it daily, for eight days, and sent to 
several other naturalists residing in other parts of Europe, at 
Louvain, Copenhagen, and Giessen. Prof. Von Beneden re- 
ceived his at Louvain, May 27th, and tried the following ex- 
periments: ‘ On the ‘day of their arrival, at 9 o’clock a. m., 
half a proglottis was given to each of two young sheep, about 
two months old, and in the afternoon each of them took an 
entire proglottis. On the 3d of June, one of them, marked 
No. 1, swallowed another proglottis. . The first symptoms of 
vertigo made their appearance on the 13th of June; on the 
morning of the 15th, I was told that the one marked No. 2 
was dying. Its head was burning hot, its eyes red, its legs 
bent under its body ; it beat with its head against the railings, 
and turned it constantly in one direction. It was then killed. 
The upper and lower surfaces of the two hemispheres of the - 
brain presented irregular grooves which might be taken for 
the deserted tubes of certain annelids (Figure 65) ; these have 
been already mentioned by M: Kiichenmeister. There were 
about a dozen of them. At the end of these tubes there were 
the same number of Cenuri, almost all lodged in the cortical 
substance of the brain. Some of them were removed with the 
membranes of the brain. They were of nearly the same size, ° 
about three or four millimetres in diameter. These Cenuri 
as yet only consisted of a simple milk-white vesicle filled with 
fluid. The heads were not yet to be seen. * * * 
* * The second sheep (No 1), was killed on the 
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