1885.] Taenia Echinococcus in the Domestic Dog. 457 



It seemed clear to me that all the entozoa present were bred after 

 the effect of the doses of kamala had passed away, and consequently 

 that the specimen of Taeniae echinococcus was forty-two days old, and 

 the product of the experimental "feeding." 



Summary. 



In three out of the four dogs experimented upon, Taenia echinococ- 

 cus was found, and in the unsuccessful case it is doubtful whether 

 living scolices were given to the dog. 



The dogs were examined at various periods after the feedings, viz., 

 20, 32, 42 days, and the Taeniae found corresponded in stage of develop- 

 ment with the interval of time that had elapsed since the feeding. 



I am indebted to Dr. Dunlop, of the Adelaide Hospital, for the 

 drawings of the Taeniae bred in the experiments recorded, and also for 

 the illustrations of ripe Taeniae procured from stray dogs, examined by 

 me in Adelaide. 



XIII. "Note upon the frequent Occurrence of Tcenia Echino- 

 coccus in the Domestic Dog in certain parts of Australia." 

 By John Davies Thomas, M.D. (Lond.), F.R.C.S. (Eng.), 

 lately Physician to the Adelaide Hospital and Member of 

 the Council of the University of Adelaide. Communicated 

 by T. S. Cobbold, M.D., F.R.S. Received June 4, 1885. 



From the well-known prevalence of hyatid disease (both in man 

 and the domestic herbivora) in certain parts of the Australian con- 

 tinent, it might naturally be expected that Tcenia Echinococcus should 

 be often found in the domestic dogs of these parts, but as far as I 

 know, no investigation had been made by any observer with a view to 

 the determination of the point in question. 



Accordingly, towards the close of the year 1882, I commenced an 

 inquiry into the matter, and although I have been prevented by the 

 claims of my daily professional duties from an exhaustive investigation 

 of the point, yet the facts already ascertained fully account for the 

 very serious prevalence of hyatid disease in the localities where 

 investigation has been made. 



Dogs were examined at the following places in South Australia :— 



1. In the city of Adelaide ; 2. At Mount Gambier ; 3. AtMillicent; 

 4. At Penola. 



The three last-named places are situated in the south-eastern district 

 of the province, which is the most highly infected part of Australia as 

 regards hyatid disease. 



