412 ATONICZDISEASES, 
of the oviduct, at the lateral opening, to the middle of the joint, 
and inclined in a curved or slightly wavy line to near the middle 
1 
of the posterior margin of the segment, 
where it terminates in a small oval 
vesicle. This, as seen by transmitted 
light, is subtransparent in the centre 
and opaque at the circumference, indi- 
cating its hollow or vesicular structure. 
The duct, or vas deferens, contains a 
grumous secretion; it is slightly dilated 
just before its termination. In this 
species, therefore, the ova are impreg- 
nated on their passage outward.”— 
(Cyclopedia of Anatomy, art. Entozoa.) 
From this minute description it may be 
gathered that the ova are in enormous 
numbers, each section of the worm being 
capable of producing them to an almost 
indefinite extent ; and as they are passed 
out of the body with the feces, it is not 
surprising that they are readily com- 
municated from one dog to another, as 
is almost proved to be the case from the 
fact of their prevalence in certain kennels 
and absence from others. The injury 
caused by these worms is twofold, de- 
pending partly upon the abstraction of 
nourishment which is absorbed by the 
worm, and partly by the irritation pro- 
duced by its presence in the intestines ; 
and hence it is of the utmost importance 
to get rid of so troublesome a customer. 
The Kidney-worm (Strongylus gigas) 
‘inhabits the kidney of the dog, as well 
as that of the wolf, otter, raccoon, glutton, 
horse, and bull (see fig. 6). It is gene- 
rally of a dark blood-colour, which seems 
to be owing to the nature of its food, which is derived from 
