40 THE GENETIC AND THE OPERATIVE EVIDENCE 



satisfaction to analyze what this means. As has been pointed out, and 

 as the pictures show, the castrated Sebright changes his attitude, but 

 whether this is a change due to his new contour, or to a new balance 

 resulting from a large tail, or to a let-down resulting principally from 

 effects on the nervous system, is difficult to determine. The same 

 statements apply in part to the castrated cock of ordinary breeds, but 

 not to the same degree, since the change after castration, in feathering 

 and in carriage at least, is slight. 



The conclusions that the " amount of lutear cells or pigment (?) is 

 in precise correlation with the degree of external somatic femaleness 

 exhibited by the individual" is of especial interest in connection with 

 the Sebright evidence. It is difficult, however, to gather from the 

 body of the paper what the absolute amount of luteal cells is that is 

 present, for even in some of the more male-like birds with an ovotestis 

 the description leads one to suppose that there may be as much luteal 

 material present as in some of the more female birds with infantile 

 ovaries or cystic tumors. 



Pearl and Curtis (1909) described "a case of incomplete herma- 

 phroditism" in a Barred Plymouth Rock fowl. Externally the bird 

 looked like a hen, but "the head and neck resembled these parts in 

 the cockerel," especially the comb and wattles. The bird was never 

 seen to tread a hen, nor did it ever crow normally. An ovary and 

 oviduct were found on the left side, the former no larger than that of a 

 laying hen after removal of the large yolks. No eggs were visible on 

 its surface. On the right side a testis (9 mm. by 6 mm.) and vas 

 deferens were present. No eggs were found in the ovary, and it gave 

 every indication of being in a degenerating condition, with no eggs 

 or egg follicles in it. The testis had no "normal seminiferous tubules," 

 but indications of cellular rods were present. The organ is in all 

 probability a degenerating testis. 



A Leghorn 2 years old has been described by Shattuck and Selig- 

 mann (1906) that had the full-developed comb and wattles of the 

 cock, but the former drooped slightly to one side as in the hen. Well- 

 developed spurs were present. The plumage was mainly female, with 

 neck-hackles moderately developed, and with "saddle-hackles" prac- 

 tically absent. The tail, though not typically female, lacks sickle 

 feathers. The bird excited no notice from other birds of either sex. 

 A large left oviduct and the distal end of a right oviduct were present. 

 Two vasa deferentia were also present. In the left side a flattened sex- 

 gland (3 cm. high) was found, made up of testicular tubules. Two 

 small ova were found in its posterior end. The right gonad was also 

 tubular (testis). 



The occurrence of real testicular tissue in one of the Holland birds 

 and in three others described by Boring and Pearl, as well as in one 



