530 PROGRESS OF VETERINARY SCIENCE AND ART. 
of advancement ; in thirty-eight days the taenia had arrived 
at maturity, and appeared, like those in the previous experi- 
ments, to correspond exactly with the t. serrata and t. solium ; 
in two other dogs the experiment was rendered nugatory by 
the dogs being ill of distemper at the time. 
“Fifth series . — The last of the experiments related by Von 
Siebold were made with echinococcus animalcules (e. veteri- 
norum) of domestic cattle, which is probably not specifically 
different from that of man. As many as twelve young dogs, 
and also a fox, received a quantity of the small echinococci 
in milk, and on being examined at various periods from the 
commencement up to twenty-six days, there were found, in 
all different stages of development, small taeniae totally 
different from any observed in the previous experiments, or, 
indeed, from any one accurately distinguished or described 
by helminthologists. This Von Siebold proposes to call 
taenia echinococcus. It is remarkable for its very small size, 
and for the small number of its joints, which never amounted 
to more than three, and for the circumstance that the re- 
productive organs, which are confined to the three last joints, 
become perfect, and the anal joint separates as a pro- 
glottis at a very early period . 55 
Eschricht and Bendz have repeated Kiichenmeister’s and 
Von Siebold’s experiments. Haubner has been also inde- 
fatigable in trying to solve the very interesting questions 
which relate to the subject. It appears that when lambs are 
made to swallow rings of the taenia serrata, besides the 
bladders formed on the surface of the brain, there existed 
milk-white or yellowish bodies, from one to two lines in 
length, embedded in the muscles and heart ; they had sharply 
defined cavities in their interior; their cavities, with thick 
walls, were filled with granular matter. At an early period 
after the ingestion of the taenia, the hydatids cannot be 
recognized as coenuri, inasmuch as their heads are wanting. 
It results from Kiichenmeister’s and Haubner’s experiments, 
that the heads only form after a certain time, perhaps several 
-weeks of the first development of the bladder. The white or 
yellow bodies found in the muscles were evidently the eggs of 
the tape-worms, which, however, not being in organs adapted 
for their development, were soon in process of destruction. It 
results from the experiments of Kiichenmeister and Dr. Roll, 
director of the Veterinary School of Vienna, that the eggs of 
taeniae even in a rotten condition, having travelled for seventeen 
or eighteen days, provided they never get dry, if given to 
lambs would develope into coenuri. It appears that in pro- 
portion as the rings of the tape-worm are allowed to remain 
