Internal Parasites. 223 
all cases be eschewed, because they are liable to cause much 
suffering without entailing any adequate result. 
It is also worthy of remark that, after the expulsion of 
the worms, everything tending to support the system should 
be employed in view of restoring the animal to perfect 
health ; and lastly, as a hygienic or prophylactic measure, 
I would advise the frequent application either of carbolic 
acid solutions, or of salt and water, to the flooring of ken- 
nels. Furthermore, I would strongly recommend the 
occasional throwing down of bucketfuls of boiling hot 
water, since the performance of this very simple act could 
not fail to be productive of good results in ways too 
numerous to be particularised. : 
The Cruel Thread-worm (filaria tmmitis) inhabits the 
heart of the’ dog. Dr. Cobbold observes: “If a female 
Filaria tmmitis be removed from the heart of a dog, and 
be examined with a microscope, the oviducts will be found 
to swarm with eggs and embryos, in all stages of develop- 
ment.” Dr. Jones Lamprey, writing from China, July, 1865, 
says: “The hearts of native and foreign dogs at Shanghai 
are zzvarzably found to contain these entozoa,” and he 
suggests that the animals may have obtained their parasites 
from ova of ascarides passed by man. He also remarks 
that human excrements constitute “the principal’ food of 
the native dog,” and he asserts that the faeces are “not 
disliked by the foreign dogs, however well fed.” 
Dr. Cobbold continues: “The symptoms of the disease 
are extremely variable; some of the dogs dying suddenly 
in a fit, whilst others linger and betray evidences of excru- 
ciating pain. As to treatment, it is obvious that nothing 
can be done when the parasites have once got possession © 
of so vital an organ as the heart. Nevertheless, further 
researches may enable us to suggest prophylactic measures, 
by which the epizootic may be checked. There is one im- 
portant point that ought not to remain long unverified. We 
want to know for certain whether the blood of these doys 
