88 THE INTERNAL PARASITES OF 



in all stages of development. Of this fact I have had 

 abundant proof by the examination of the specimens 

 sent to me by Mr. Swinhoe ; but those who desire full 

 details respecting the minute structure of the mature 

 worm and its embryos should consult the admirable 

 paper by Assist. Professor F. H. Welch, of Netley (The 

 Lancet for March 8, 1873). Mr. Welch not unreason- 

 ably hopes that his record may have supplied data calcu- 

 lated to throw light upon the origin and nature of the 

 nematode blood worms recently discovered by Dr. Lewis 

 in the human body in India. 



In regard to facts of practical moment in connection 

 with sanitary matters, I would call particular attention 

 to the statements of Dr. Jones Lamprey, who, 'writing 

 from China in July, 1865, tells us that "the hearts of 

 native and foreign dogs at Shanghai are invariably 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 fasces are " not disliked 

 by the foreign dogs, however well fed." Dr. Lamprey 

 thinks that the presence of the hgematozoon is only pre- 

 judicial to the canine bearer when the animal is out of 

 sorts from some other cause than the parasitism itself. 

 On the other hand, the tenour of Mr. Dare's able 

 communication to the Field shows very clearly that it 

 must be the worms, and the worms only, which thus 

 prove fatal to the helpless bearers. 



It is not a little instructive to notice from the testimony 

 thus borne by Dr. Lamprey that the canine animals of 

 China participate in the disgusting habits to which I 

 alluded when speaking of the behaviour of Indian 



