DR. T. S. COBBOLD ON EjSTTOZOA IN THE DOG. 287 



given, I may mention that I have caused TricMnce to be trans- 

 ferred from the flesh of man to a hedgehog, then from the muscles 

 of this hedgehog to a dog, and ultimately from the dog to a pig. 

 It was in this last-named animal that I obtained about 15,000,000 

 TrichincB — enough to have trichinized half the inhabitants of 

 London, could each individual have been induced to partake of 

 a minute portion of the uncooked flesh. As it was, I had some 

 difiiculty in persuading bystanders at the post mortem dissection 

 that the perfectly healthy -looking flesh had anything the matter 

 with it ; and one person actually carried ofi" the heart of the 

 animal as a perquisite. Fortunately TricMnce do not stay in the 

 substance of the heart, although they pass through it ; and thus 

 the lucky person who ate the heart could by no possibility have 

 sustained any injury, even if it were insufficiently cooked. 

 Lastly, I will only add that I consider further experiments with 

 Trichina spiralis unnecessary, and even undesirable from a hygienic 

 point of view. 



7. Ascaris marginata. — Of all the parasites infesting the dog in 

 England this species is the commonest. I have met with it in 

 about thirty out of forty dogs dissected by myself and friends. It 

 does not appear to be quite so common abroad ; nevertheless, out 

 of 144 dogs dissected at the Vienna Museum, it was present in 

 no less than 104 instances. At Copenhagen Dr. Krabbe found 

 it present 122 times out of 500, or in 24 per cent, of the dogs he 

 examined ; but in Iceland, where other forms of canine entozoa are 

 extremely abundant, only two dogs out of 100 were found to en- 

 tertain this species. Fortunately the common roundworm of the 

 dog is a very harmless parasite, so far as the health of the people 

 is concerned, and it is apparently only in exceptional instances 

 that it proves injurious to the dog itself. 



8. Eustrongylus gigas. — This species is probably the rarest of 

 canine entozoa. The only specimen which I have seen as coming 

 from the dog is the very perfect one preserved in the Museum of 

 the Eoyal Veterinary CoUege, London. Probably not one in 

 5000 dogs harbours this entozoon ; but since it is liable to occur 

 in man, and has several times been noticed in the congeners of 

 the dog, the possibility of its becoming more frequent should be 

 considered. The Museum of the Eoyal College of Surgeons, 

 London, contains some fine examples and several dissections 

 of this parasite. 



9. BotJirioeephalus latus. — Although there is some difficulty iu 

 determining the number of species oi Botliriocephalus liable to 



