SEXUAL CHARACTERS OF SOME DOMESTIC BIRDS. 



13 



After the cotton has been inserted, all that is necessary is to close the 

 ribs together with one or two ties, depending on the size of the bird. 

 Finally, the skin is closed with a continuous suture. It is not necessary 

 to remove suture or cotton at a later time, as they apparently never 

 interfere with the health of the bird. It is not necessary to use any 

 but the most ordinary aseptic methods. 



DESCRIPTION OF CASES. 



DUCKS. 



During the course of the present work, females and males have been 



operated on, some with successful results, i. e., complete gonadectomy; 



others with absolute failure, while many yielded partially successful 



