. Gonadectomy in relation to the secondary sexual characters of some domestic birds . Rocks. The female Minorca hasa larger comb than that of the Plymouth Rock male, but, of course, thecombs of the Minorca males are correspondingly larger. Moreover, inmost instances the comb of the male has a proportionally larger bladethan that of the female. A further difference is found in the texture ofthe comb, that of the female being finer than that of the male. Finally,in the female Leghorn and similar breeds the comb almost always lopsto one side. This secondary sexual character is not universal among
. Gonadectomy in relation to the secondary sexual characters of some domestic birds . Rocks. The female Minorca hasa larger comb than that of the Plymouth Rock male, but, of course, thecombs of the Minorca males are correspondingly larger. Moreover, inmost instances the comb of the male has a proportionally larger bladethan that of the female. A further difference is found in the texture ofthe comb, that of the female being finer than that of the male. Finally,in the female Leghorn and similar breeds the comb almost always lopsto one side. This secondary sexual character is not universal amongdomestic fowl, but is most common in the Mediterranean races. Or-dinarily, capons are derived from the low-combed races, a circumstancewhich has made it difficult to say that the capons comb is not the Leghorns, however, the capons comb is practically , the only possible conclusion is that the capons comb andwattles are infantile. They do not, of course, remain of the same size asthat of the chick at the time of the operation. The base of the comb. Comparative size of the combs of Brown Leghorn fowls. a, an adult male, h and c, two adult females, d, an adultcapon. Dra^ving one-half natural size. increases in length with the increase in size of the skull. The heightof the comb also increases somewhat in absolute size, but not in pro-portion to the comb length. The comb of the Leghorn capon, however,is about the same size as that of some Plymouth Rock females. Thecomparative sizes of the combs of the normal Brown Leghorn, male andfemale, and of the capon are shown in the accompanying text-figure. In the castrated females, the comb has developed in varjdng degrees,becoming very large and male-hke in some, while in others it hasremained comparatively small. As yet there is no clear evidence ofthe causes of this difference. Certainly it is not connected with thehypertrophy of the Wolffian body, for this has been found in everyindividual. The birds wi
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