My dear Sir.

It is the greatest possible satisfaction to a man nearly at the close of his career to believe that he has aided or stimulated an able and energetic fellow worker in the noble cause of Science. Therefore your letter has deeply gratified me—¹ I am writing this away from home, as my health failed & I was forced to rest;² & this will account for the delay in answering your letter— No doubt on my return home, I shall find the memoir which you have kindly sent me—³ I shall read it with much interest, as I have heard something of your work from Prof^r. Geikie & have read his admirable Ice Age.—⁴ I have noticed the criticisms on your work, but such opposition must be expected by everyone who draws fine grand conclusions, and such assuredly are yours as abstracted in your letter.— What magnificent progress Geology has made within my life time!

I shall have very great pleasure in sending you any of my books with my autograph; but I really do not know which to send.—⁵ It will cost you only the trouble of a post-card to tell me which you would like, & it shall soon be sent. Forgive this untidy note, as it is rather an effort to write.

With all good wishes for your continued success in Science & for your happiness, I remain | My dear Sir. | Yours very faithfully— | Charles Darwin.