For example, and before I in the least knew what the result would be, I fixed on this as a crucial instance,—the reindeer alone (of cervidæ) has horns in both sexes, therefore, according to my rule, their horns should be developed very early in life;² and I now hear from Sweden that these appear within two or three weeks after birth:³ whilst with all other deer, in which the horns are confined to the male, these do not, as far I have hitherto ascertained, appear till nearly a year after birth. So it is with the horns of antelopes. Now you will see that if a large part of the variation in stature occurs late in life among male deer-hounds, this variation will (on such a principle) tend to be transmitted to the males alone, and will not affect the females as any other ordinary variation would do.⁴