Note 15 — Chapter XXV · LAWS OF VARIATION, continued.—CORRELATED VARIABILITY.

In the third chapter I have said that “the hair and horns are so closely related to each other, that they are apt to vary together.” Dr. Wilckens (“Darwin’s Theorie,” ‘Jahrbuch der Deutschen Viehzucht,’ 1866, 1. Heft) translates my words into “lang-und grobhaarige Thiere sollen geneigter sein, lange und viele Hörner zu bekommen” and he then justly disputes this proposition; but what I have really said, in accordance with the authorities just quoted, may, I think, be trusted.