73

I suppose you have considered in your own mind that

The hypothetical tendency to greater numbers beneath the mean than above  it will probably so in acting until the organism has become accustomed to its new & poor conditions; & then the Horns will after a time become through intercrossing fixed in size as any organ now is, but varying according to Quetelet's law); & they will have been diminished in size. Thus they will remain until a new period of poor conditions arrives, & then the process will be repeated, until ever distribution is effected. (Possibly absolute elimination is not very often effected because very young animals nourished in the egg or seeds are not exposed to very severe conditions.)