Charles Darwin an Ernst Haeckel, Down, 25. September 1873
Down, | Beckenham, Kent.
Sep 25. ’73
My dear Häckel,
I thank you for the present of your book, & I am heartily glad to see its great success. You will do a wonderful amount of good in spreading the doctrine of Evolution, supporting it as you do, by so many original observations. I have read the new preface with very great interest. The delay in the appearance of the English translationa vexes & surprizes me, for I have never been able to read it thoroughly in German, & I shall assuredly do so when it appears in English. Has the problem of || the later stages of reduction of useless structures ever perplexed you: this problem has of late caused me much perplexity. I have just written a letter to ‘Nature’ with a hypothetical explanation of this difficulty, & I will send you the paper with the passage marked. I will at the same time send a paper which has interested me; it need not be returned. It contains a singular statement bearing on so-called spontaneous generation. I much wish that this latter question could be settled; but I see no prospect of it. If it could be proved true this would be a most important to us. A good evolutionist || in America, viz: E. Morse has lately published in the Proc. of the Boston Soc. Nat. Hist. a remarkable paper on the the Brachiopoda; & he seems to me to make out pretty clearly that they must be classed actually with Annelids. As for myself I have been working for many months on plants, viz: –b on physiological points. Whenever I publish I will of course send you my little book.
Wishing you every success in your admirable labours, I remain
My dear Häckel
Yours very sincerely
a korr. aus: translations; b eingef.: viz: –