1885.] the Dog bred from the Echinococci of Man. 453 



Naunyn's experiments are, the complete failure in one instance, and 

 the apparent absence of any precautions to prevent prior accidental 

 infection in the other case. 



The Author s Experiments. 



On 25th June, 1883, I purchased four puppies, which were said to 

 be a cross between a bloodhound and a mastiff. At the time they 

 came into my possession they were seven weeks old, and up to that 

 moment they had never left a small enclosed yard, in which their 

 mother was chained. Beyond the maternal milk, they had received 

 no food, except cooked scraps from the kitchen of their owner, and 

 indeed very little of anything except their mother's milk. 



On the evening of June 25th they were enclosed in a recently 

 disused powder magazine, situated on the North Park Lands,. 

 Adelaide. The magazine in question is now the property of the 

 University of Adelaide, and its use for the purpose of these expe- 

 riments was kindly granted to me by the Council of the University. 



During the seclusion of the dogs, they received only cooked food 

 from my own kitchen, and rain water collected from the roof of the 

 magazine, and stored in a new tank within the magazine enclosure. 



The animals remained in good health and grew rapidly; 



Experiment No. 1. — On July 5th I aspirated a hydatid tumour 

 situated in the epigastrium of a woman, who was then a patient 

 under my care in the Adelaide Hospital. 



Two ounces of nearly clear hydatid fluid were removed, and as I 

 thought I could see with the naked eye a few groups of scolices 

 floating in the fluid, I administered it, mixed with milk, to one of the 

 dogs. The feeding took place about two hours after the fluid was 

 removed from the human body. The dog continued in good health, 

 and was killed by prussic acid on August 5th, i.e., on the 31st day 

 after the feeding. No tapeworms were found, but several ascarides 

 were present in the small intestine. 



This experiment was therefore quite negative in its results ; but as 

 the patient had been some years previously operated on for the same 

 hydatid, and as consequently it is very doubtful whether any living 

 scolices were administered^ it was used only in establishing the original 

 freedom of the dogs from Echinococcus. 



Experiment No. 2. — For some months it was impossible to procure 

 any living scolices, but on October 16th I fortunately met with a 

 suitable case. The patient, a healthy young man, aged twenty-five, 

 was found to have a hydatid cyst on the upper surface of the liver, 

 which was aspirated by me on October 16th, 1883. Twelve ounces 

 of perfectly normal hydatid fluid were removed. Upon microscopic 

 examination, a considerable number of scolices, mostly collected into 

 groups, were found. 



