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DOWN, BROMLEY, KENT,

4th December 1868.

MY DEAR SIR,—As you may be anxious about the book, I write to say that I have received it, the MS. and your note. I will soon read the MS. and as you do not object, will perhaps keep the book till Christmas, as my second son, who is a mathematician, and who was extremely interested by your last papers, and who wished to read the others, will then be at home.—

Pray believe me, yours truly obliged, CHARLES DARWIN.

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DOWN BROMLEY, KENT, S.C.

10th January 1869.

MY DEAR SIR,—I write one line to say that I am ashamed of myself for having kept your book so long, partly for my son's sake, and partly for my own sake, as I have not yet come to the place where I want to quote it. If I hear from you, I will send it at once; if I do not hear, I will keep it for about ten days more, and will then send it registered, so you shall get it safe. With sincere thanks, yours very faithfully, CHARLES DARWIN.

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DOWN, BROMLEY, KENT, S.C.

6th, February 1869.

MY DEAR SIR,—I am very much obliged for your long and to me extremely interesting letter. It is consolatory to me that you are inclined to give a little more age to the world. I read Mr. Moseley's article in Scientific Opinion about three or four weeks ago; I have had the house searched, but cannot find the copy. The article was given as extracted from the Proceedings of the Royal Society; but I have looked in the two last numbers which I have received, and it is not in them. Hence, I suppose, the author or secretary sent an abstract beforehand, and I suppose it will appear in the next number of the Proceedings. The article interested me,

though I could not follow all the reasoning, as I hear he is a sound man.

I was reminded of my crude notion that the cause

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of elevations, volcanic phenomena, etc., was cosmical, by my son telling me about Captain Clark's paper in Philosophical Transactions, which you probably know, on the globe being a little flattened at the equator, that this stands in relation to relative position of continents and oceans. It would be a great gain if some one could show a cause of the many changes of level in the crust of the earth.—With very sincere thanks, believe me, yours very faithfully,

CHARLES DARWIN.

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DOWN, BROMLEY, KENT, S.C.

24th February 1869.

MY DEAR SIR,—I am very much obliged for the proofs, which have interested me greatly. I cannot pretend for a moment to form any judgment, but your view seems to me very ingenious. If accepted, it will be a most

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satisfactory and great step in our knowledge of glacier movement.—In haste, yours very sincerely, CHARLES DARWIN.

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The following letter from Mr. Charles Darwin shows in what esteem he held Croll, while Croll's reply is characteristically candid and modest.

DOWN, BECKENHAM, KENT,

19th July 1871.

MY DEAR SIR,— Mr. Youmans of the United States is very anxious to get a series of small monographs

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written by the most competent English authors on various subjects, to be published in the United States and I suppose in England. Mr. Youmans is in some way connected with the great firm of Appletons in New York. He has asked me to name some of the most competent men, and I have thought that you would excuse my giving your name, and this note as a kind of introduction. I should add that I do not know on what subject he wishes you to write. I do, however, know that some very good judges think highly of his scheme. Pray excuse the liberty which I am taking, and believe me, yours very faithfully, CHARLES DARWIN.

P.S.—Many thanks for some interesting papers which you kindly sent me some time ago.

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