G. GENERAL NATURAL HISTORY AND ZOOLOGY. 173 



rately applied to the granulating surface. 5 A, January, 

 1871,100. 



GRAFTING OF FART OF ONE ANIMAL IN ANOTHER. 



Many curious accounts have been published of the readi- 

 ness with which the living portion of one animal can be graft- 

 ed into the body of another, and continue to grow indefinitely 

 afterward, so as to constitute an integral portion of the lat- 

 ter. An interesting case of this kind has been published by 

 Mr. Phillipeaux, although the experiment itself was made 

 nearly twenty years ago. The gentleman in question, after 

 having made an incision in the head of a young cock, intro- 

 duced into it the incisor tooth of a Guinea-pig that had been 

 born a few hours previously, and which, complete and fur- 

 nished with its bulb, was so placed that, the bulb being at 

 the bottom of the wound, the extremity of the tooth turned 

 outward. On the day the experiment was made the tooth 

 was eight millimetres long and two millimetres thick, and 

 when the animal was killed, ten months afterward, the total 

 length of the tooth was found to measure thirteen millime- 

 tres. While at the beginning of the experiment the tooth 

 was completely imbedded in the incision made, at the expira- 

 tion of the period mentioned it projected five millimetres 

 from the surface. The interest of this experiment consists 

 in the fact of a graft having been made from one animal to 

 another of an entirely different class, which, of course, is more 

 astonishing than the transfer of the spur of a cock to its 

 comb, as made by Hunter and Sir Astley Cooper, or the 

 amusing operation, said to have been performed by some 

 French Zouaves, of introducing the end of the tail of a rat 

 into the skin of the forehead, and after keeping it in that po- 

 sition until the juncture had taken place, cutting off a portion 

 of the tail and leaving it to project from the forehead like a 

 horn, thus producing an animal of such an extraordinary 

 physiognomy as to have deluded a naturalist into the belief 

 that he had before him a remarkable new form of rodent. 

 12 A, July 28,262. 



m'donald's theory of nervous action. 



Dr. Robert M'Donald has presented a new theory of nerv- 

 ous action to the Royal Irish Academy, this being expressed 



