When are we to meet again? And when are we to have a "stand-up fight" on the erratics of the Alps? You will see by the abstract of my memoir appended to my Alpine affair that I have taken the field against the extension of the Jura! In a word, I do not believe that great trunk glaciers ever filled the valleys of the Rhone, etc. Perhaps you will be present at our next meeting of the British Association at Edinburgh, August, 1850. Olim meminisse juvabit! and then, my dear and valued and most enlightened friend, we may study once more together the surface of my native rocks for "auld lang syne.". . . FROM CHARLES DARWIN. DOWN, FARNBOROUGH, KENT, June 15 [1850, probably]. MY DEAR SIR, I have seldom been more deeply gratified than by receiving your most kind present of "Lake Superior." I had heard of it, and had much wished to read it, but I confess it was the very great honor of having in my possession a work with your autograph, as a presentation copy, that has given me such lively and sincere pleasure. I cordially thank you for it. I have begun to read it with uncommon interest, which I see will increase as I go on. The Cirripedia, which you and Dr. Gould were so good as to send me, have proved of great service to me. The sessile species from Massachusetts consist of five species. . .Of the genus Balanus, on the shores of Britain, we have ONE species (B. perforata Bruguiere), which you have not in the United States, in the same way as you exclusively have B. eburneus. All the above species attain a somewhat larger average size on the shores of the United States than on those of Britain, but the specimens from the glacial beds of Uddevalla, Scotland, and Canada, are larger even than those of the United States. Once again allow me to thank you with cordiality for the pleasure you have given me. Believe me, with the highest respect, your truly obliged, C. DARWIN. The following letter from Hugh Miller concerning Agassiz's intention of introducing "The Footprints of the Creator" to the American public by a slight memoir of Miller is of interest here. It is to be regretted that with this exception no letters have been found from him among Agassiz's papers, though he must have been in frequent correspondence with him, and they had, beside their scientific sympathy, a very cordial personal relation. EDINBURGH, 2 STUART STREET, May 25, 1850. DEAR SIR, I was out of town when your kind letter reached here, and found such an accumulation of employment on my return that it is only now I find myself able to devote half an hour to the work of reply, and to say how thoroughly sensible I am of the honor you propose doing me. It never once crossed my mind when, in writing my little volume, the "Footprints," I had such frequent occasion to refer to my master, our great authority in ichthyic history, that he himself would have associated his name with it on the other side of the Atlantic, and referred in turn to its humble writer.