Note 62 — A DEFENCE OF MENDEL’S PRINCIPLES OF HEREDITY.

Read in this connexion Pearson, K., Grammar of Science, 2nd ed. 1900, pp. 390–2.

Professor Weldon even now opens his essay with the statement—or perhaps reminiscence—that “it is perfectly possible and indeed probable that the difference between these forms of inheritance [blended, mosaic, and alternative] is only one of degree.” This may be true; but reasoning favourable to this proposition could equally be used to prove the difference between mechanical mixture and chemical combination to be a difference of degree.