158 PARASITES OF MAN 



flesh containing Trichinae was administered by myself to a black 

 bitch. The dog being destroyed five days subsequently, 

 neither intestinal nor muscle-Trichinae were discovered. It was 

 thought that the dog had thrown up the bolus, which was 

 strongly saturated with chloride-of-zinc solution. The bolus 

 consisted of a portion of the pectoralis major of a subject 

 brought to the dissecting-room at the Middlesex Hospital. The 

 cysts were highly calcified, but the majority contained living 

 embryos, which were quite unaffected by the zinc solution 

 injected into the body to prevent decomposition. At the same 

 date a small white puppy was experimented on and examined 

 with precisely the same results. In either case it was too early 

 to expect muscle-flesh-worms to have become developed. 



Exp. 3. Half an ounce of the same trichinous human flesh 

 was given (at the same date) to a black-and-tan puppy reared 

 at the Royal Veterinary College, a second " feeding" being 

 administered on the 21st of March, or six days after the first. 

 In this case Mr Pritchard, who fed the animal, took the pre- 

 caution to chop the muscle into small pieces, and to mix it with 

 other food, in order that the flesh might be the more readily 

 retained in the stomach. The puppy was not destroyed until 

 the 15th of the following June, when, on examination, numerous 

 encysted but non-calcified muscle-Trichinae were found in all the 

 voluntary muscles subjected to microscopic scrutiny. 



Exp. 4. An ounce of the same flesh was given to a dark- 

 colored pig on the 15th of March, and again on the 20th, 

 several other " feedings" being also administered during the 

 month of April, 1865. It was destroyed on the 16th of May, but 

 no Trichinae were detected. 



Exp. 5. An ounce of the same human muscle-flesh admi- 

 nistered to a small sheep (which was subsequently killed on the 

 29th of June) also produced negative results. 



Exps. 6 and 7. " Feedings" were at the same time adminis- 

 tered to a rat and mouse. The mouse died on the 2nd April, 

 when I examined its muscles without success. On the follow- 

 ing day the rat unfortunately made its escape, but whether 

 trichinised or not cannot be said. 



Exp. 8. An ounce of trichinous human flesh was given to a 

 donkey, in the form of " balls," on the 20th of March ; and 

 during the month of June four other separate " feedings" with 

 trichinous dog's flesh were also administered. The animal was 

 removed from the College without the result being ascertained. 



