1885.] 



the Dog bred from the Echinococci of Man. 



455 



However, in consequence of the position of the Lead of tliis speci- 

 men on the slide, it is difficult to accurately count the hooks. They 

 appear to be from thirty-five to forty in number. 



The dimensions of the hooklets, as measured by Dr. Whittell, were : 

 — Maximum length, -^j^ inch ; length of root-processes, 14 1 20 inch ; 

 greatest transverse diameter at junction of claw with root-processes, 

 inch. The root-processes were well developed. It should be 

 mentioned that on October 14, i.e., four days before the date of the 

 examination, this dog was allowed by a careless attendant to escape 

 for twenty-four hours from the magazine ; but as it was known to 

 have concealed itself on the premises of a neighbour for the whole of 

 the time, and as it was impossible for it to have procured any meat in 

 this period, the experiment cannot be regarded as vitiated. Besides 

 the short space of time (four days) that intervened between the tem- 

 porary escape of the dog and its examination, renders it certain that 

 the specimens of Taenia echinococcus found were the result of the 

 experimental feeding thirty-two days before. 



As regards the specimens of Taenia cucumerina present, these owed 

 their origin to dog-lice swallowed by the animal, and the lice them- 

 selves were no doubt communicated to the dog in its babyhood by its 

 mother. 



Experiment No. 3. — A third dog was, on November 16, 1883, fed 

 upon a considerable number of daughter cysts and scolices procured 

 from the body of a woman who died of phthisis at the Adelaide Hos- 

 pital on the afternoon of the previous day. A further " feeding " 

 from the same source was administered on the morning of the 17th. 

 Living scolices were found present in a portion of this " feeding " ten 

 hours after the rest had been given to the dog. On December 10, 

 1883, Dr. Dunlop, of the Adelaide Hospital, supplied me with about 

 8 ounces of nearly clear hydatid fluid containing a great number of 

 scolices. The fluid had been obtained from two hydatids occupying 

 the pelvis of a woman who had died on December 9th. A consider- 

 able dose of the scolices mixed with milk was given to the same dog 

 twenty-five and a half hours after the decease of the patient. This 

 " feeding " contained some living scolices, but the majority of those 

 examined upon the hot stage exhibited no movement when warmed, 

 and hence were probably dead. On December 30th, forty-four days 

 after the first feeding, and twenty days after the second dose of scolices, 

 the small intestine of this dog was examined by Dr. Whittell and 

 myself. Contrary to expectation, we found no ripe Taenia echinococ- 

 cus; but after a patient examination we found one complete, but 

 juvenile specimen of this worm, and the terminal joints of seven 

 others. These were quite young, being very small (about one-twelfth 

 inch when complete), and extremely fragile. However, the specimens 

 showed plain indications of the generative organs, but no distinct 



