206 DE. T. S. COBBOLD OK TBICUINA SPINALIS. 



cMoride-of-zinc solution. Tlie 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 embrji-os, 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, . 

 of course, too early to expect muscle-fleshworms to have become 

 developed. 



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

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

 Eoyal 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 precaution 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 pnppy was not destroyed until the 15th of the fol- 

 lowing 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- 

 coloured pig on the 15th of March, and again on the 20th, several 

 other "feedings" being also administered during the month of 

 April (18G5). It was destroyed on the 16th of May ; but no 

 Trichinae were detected. 



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

 tered to a small sheep (which was subsequently killed on the 29th 

 of June), produced the same negative results. 



Exps. 6 and 7. " Eeedings " were at the same time administered ' 

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

 examined its muscles without success. On the following day 

 the rat made its escape, but whether trichinized or not I cannot 

 say. 



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 



doss' flesh were also administered. In this case the animal was 



.r . 



parted with without the result being ascertamed. 



Exp. 9. Erom the 15th to the 20th March, 1865, inclusive, 



three small Trichina "feedings" were likewise administered to a 



guinea-pig. This little animal was not destroyed until the 15th 



of the following June, when a positive result was obtained. The 



