It is all the kinder in you to send me this book, as I am aware that you think that I have done nothing to advance the good cause of the Descent-theory.

(306/2.

The above caused me to write a letter expressing a feeling of regret and humiliation, which I hope is still preserved, for certainly such a feeling, caused undoubtedly by my writings, which dealt too exclusively with disagreements upon special points, needed a strong denial.

I have used the Darwinian theory in many cases, especially in explaining the preservation of differences; and have denied its application only in the preservation of fixed and hereditary characteristics, which have become essentially homologous similarities.

(Note by Prof.Hyatt.)) (306/3.