My dear M^r. Agassiz.

Very many thanks for your kind letter and curious facts about the fishes—² What an extraordinary number of complex & wonderful structures have been developed in relation to sex!—

I am also particularly glad to hear about the pedicellariæ of the Echino-dermata, the homologies of which I did not in the least know— I must now find out the homologies of the “Birds-beaks” & serrated Bristles of the Bryozoa,—which I remember watching in old days with astonishment.³ I am thinking of bringing out a new & cheap edition of the Origin and if so I shall give a chapter to answering, as far as I can and space permits—Mivarts very clever book.—⁴ I have no doubt this book will produce a great effect on many— and you will think it blind prejudice when I say it has had none on me. There is not one new point in it though many are admirably illustrated. Mivart never racks his brains to see, what can be fairly said on the opposite side, and he argues as if I had said nothing about the effects of use or the direct action of external conditions; though in another part of the book on those points almost every illustration is taken from my writings & observations.— But I will not bother you with more remarks on this head.

Pray give my most sincere respects to your father. What a wonderful man he is to think of going round Cape Horn; if he does go—I wish he could go through the Straits of Magellan.⁵

With very kind remembrances from all of us to M^rs. Agassiz,⁶ and with many thanks for myself— | Pray believe me. | Yours very sincerely. | Ch. Darwin.