36 



I have shown to the Societe de Biologie at Paris, two frogs on- 

 which the wound of the heart was cicatrised after fifteen days.* 



XIII. ON A SINGULAR CASE OF ANIMAL GRAFT. 



Every one knows the experiments by which the cock's spurs 

 or many other animal textures have been grafted on the body of 

 an animal, and especially on a cock's comb. I have succeeded 

 in grafting the tail of a young cat on a cock's comb. I per- 

 formed this experiment in France in 1850. 



After having divided the tail of a young cat, I made a longi- 

 tudinal section on a cock's comb, and I united these two parts 

 one to the other, by stitching the cut surface of the cat's tail to 

 the cut surface of the cock's comb. The skin of the cat's tail 

 had been turned a little over itself, so that its internal surface 

 was in contiguity with the cut surface of the cock's comb. Eight 

 days after, I punctured the skin of the tail at a distance from 

 the cock's comb, and blood escaped, so that it was evident that cir- 

 culation was already established. The tail had been cold during 

 all the day of the operation, but it became warmer gradually 

 from the second day. The union appeared much advanced on 

 the third or fourth day. The tail was entirely fixed on the 

 eighth day. 



Unfortunately, on the eleventh day, the cock had a fight with 

 another cock, and the cat's tail was torn out from the ground 

 on which it had been fixed. I was thus deprived of the 

 opportunity of knowing what transformations should have taken 

 place in the tail. 



By examining it I found that all its tissues were fresh, and 

 that its blood-vessels contained blood. 



XIV. ON A CONVULSIVE AFFECTION PRODUCED BY CONSIDERABLE 

 INJURIES OF THE SPINAL CORD. 



I have discovered that a very violent convulsive affection is 

 the constant result of a considerable wound of the spinal cord, 

 in certain animals. It is more especially in guinea-pigs in whom 

 a transversal section of a lateral half, or a complete section of 



* See Gaz. Med. de Paris, 1850, t. v. p. 169. 



