REMARKS ON ENTOZOA. 
463 
enabled to find their way into the general organism? Is it 
by perforating the tissues by means of the hooklets with 
which their heads are furnished ? or are they received, in 
some ill-understood manner, into the course of the circulation, 
and thus carried into the different regions of the body ? — 
Journal de Medecine Veterinaire . 
REMARKS ON SOME OF THE ENTOZOA BY M. ZANGGER. 
M. Zangger, Professor of the Veterinary School at Zurich, 
has devoted much time to the study of entozoa affecting our 
domesticated animals. He has examined in particular the 
hydatids and tapeworms with a view to throw more light 
upon the modern discoveries w T hich have been made respecting 
them. In his memoir, he gives the history of these parasites, 
and the effects each has, in particular, upon the animal 
economy; he also dwells upon their mode of development, 
and especially studies their metamorphoses, as they have been 
described by German naturalists. The researches of the 
Swiss professor, however, are not limited to a simple des- 
cription of these creatures and their effects, for he proposes a 
remedy, in order to render his work more useful to society. 
We shall extract from this memoir that which has particular 
reference to preventive treatment; but in order that our 
readers may comprehend more fully what M. Zangger pro- 
poses, we shall first repeat the opinion of investigators into 
this important subject. 
According to such persons, the hydatids do not form a 
separate class of worms, but are the larvae of the tapeworm. 
The long-necked hydatid, and also the round or headless 
hydatid appear to be nothing more than the larvae of taeniae in 
an imperfect state. Their duration, however, in this form has 
not as yet been determined. 
The cysticercus pisiformis which is met with in the liver, 
omentum, and mesentery of the rabbit, being swallowed by 
the dog, is changed into the taenia serrata , which, according 
to M. Siebold, is nothing more than the taenia solium of the 
human subject. 
The cysticercus cellulosa * of the pig, the cysticercus tenuicollis 
of the ox, and the ccenurus cerebralis\ of the sheep are also 
said to produce the taenia serrata in the body of the dog, and 
the taenia solium in the human subject. The cysticercus 
fasciolaris of rats, produces the taenia crassicollis in the intestines 
* It is this cysticercus which is the cause of the measled flesh of the 
pig. 
f The hydatid of the brain of the sheep and other animals. 
