80 INFLUENCE OF HORMONES 



On July 29, 1911, a little more than eleven months 

 after the operation, I examined and killed the second 

 of these castrated cocks, the speckled mongrel-bred 

 bird. I measured the comb and wattles while it 

 was alive, in case there might be reduction in the size 

 of these appendages when the bird was killed. The 

 comb was 1| inches high by 2f inches in length. The 

 spurs were 1 inch long, curved and pointed. Saddle 

 hackles short, hanging only a little below the end 

 of the wing. Neck hackles well developed, similar 

 to those of an entire cock. Longest tail feather 

 15f inches, blue-black in colour. 



I had no entire cock of same breed, but measured 

 the entire White Leghorn for comparison. Comb 

 If inches high by 3f inches in length. (It is to be 

 remembered that the comb and wattles are especially 

 large in Leghorns.) Wattle 1J inches in vertical 

 length. Spur 1 inch long, stouter and less pointed 

 than in the capon. Longest tail feather 12 inches 

 long. 



When killed the capon was found to be very fat : 

 there were masses of fat around the intestines and 

 under the peritoneum, which made it impossible to 

 make out details such as ureter and vas deferens 

 properly. I found a white nodule about half an inch 

 in diameter attached to mesentery. The liquid 

 pressed from this was swarming with spermatozoa 

 in active motion. Two other masses about the same 

 size or a little larger were found on the sites of the 

 original testes. These also were full of mobile 

 spermatozoa, and must have grown from portions of 

 the testes left behind at castration. 



In ducks the sexual characters of the male differ 

 from those in the fowl, especially in the fact that they 



