My dear Sir, I return you my SINCERE thanks for your long letter, which I consider a great compliment, and which is quite full of most interesting facts and views. Your references and remarks will be of great use should a new edition of my book ('Variation of Animals and Plants.') be demanded, but this is hardly probable, for the whole edition was sold within the first week, and another large edition immediately reprinted, which I should think would supply the demand for ever. You ask me when I shall publish on the 'Variation of Species in a State of Nature.' I have had the MS. for another volume almost ready during several years, but I was so much fatigued by my last book that I determined to amuse myself by publishing a short essay on the 'Descent of Man.' I was partly led to do this by having been taunted that I concealed my views, but chiefly from the interest which I had long taken in the subject. Now this essay has branched out into some collateral subjects, and I suppose will take me more than a year to complete. I shall then begin on 'Species,' but my health makes me a very slow workman. I hope that you will excuse these details, which I have given to show that you will have plenty of time to publish your views first, which will be a great advantage to me. Of all the curious facts which you mention in your letter, I think that of the strong inheritance of the scalp-muscles has interested me most. I presume that you would not object to my giving this very curious case on your authority. As I believe all anatomists look at the scalp-muscles as a remnant of the Panniculus carnosus which is common to all the lower quadrupeds, I should look at the unusual development and inheritance of these muscles as probably a case of reversion. Your observation on so many remarkable men in noble families having been illegitimate is extremely curious; and should I ever meet any one capable of writing an essay on this subject, I will mention your remarks as a good suggestion. Dr. Hooker has several times remarked to me that morals and politics would be very interesting if discussed like any branch of natural history, and this is nearly to the same effect with your remarks...
CHARLES DARWIN TO L. AGASSIZ.
Down, August 19, 1868.
Dear Sir, I thank you cordially for your very kind letter. I certainly thought that you had formed so low an opinion of my scientific work that it might have appeared indelicate in me to have asked for information from you, but it never occurred to me that my letter would have been shown to you. I have never for a moment doubted your kindness and generosity, and I hope you will not think it presumption in me to say, that when we met, many years ago, at the British Association at Southampton, I felt for you the warmest admiration.
Your information on the Amazonian fishes has interested me EXTREMELY, and tells me exactly what I wanted to know. I was aware, through notes given me by Dr. Gunther, that many fishes differed sexually in colour and other characters, but I was particularly anxious to learn how far this was the case with those fishes in which the male, differently from what occurs with most birds, takes the largest share in the care of the ova and young. Your letter has not only interested me much, but has greatly gratified me in other respects, and I return you my sincere thanks for your kindness. Pray believe me, my dear Sir, Yours very faithfully, CHARLES DARWIN.
CHARLES DARWIN TO J.D. HOOKER.
Down, Sunday, August 23 [1868].
My dear old Friend, I have received your note. I can hardly say how pleased I have been at the success of your address (Sir Joseph Hooker was President of the British Association at the Norwich Meeting in 1868.), and of the whole meeting. Ihave seen the "Times", "Telegraph", "Spectator", and "Athenaeum", and have heard of other favourable newspapers, and have ordered a bundle. There is a "chorus of praise." The "Times" reported miserably, i.e. as far as errata was concerned; but I was very glad at the leader, for I thought the way you brought in the megalithic monuments most happy. (The British Association was desirous of interesting the Government in certain modern cromlech builders, the Khasia race of East Bengal, in order that their megalithic monuments might be efficiently described.) I particularly admired Tyndall's little speech (Professor Tyndall was President of Section A.)...The "Spectator" pitches a little into you about Theology, in accordance with its usual spirit...