Arts and Sci." Volume VI., page 377, 1857).) I have not read it, and shall not be able very soon, for I am much overworked, and my stomach has got nearly as bad as ever.
With respect to the discussion on climate, I beg you to believe that I never put myself for a moment in competition with Dana; but when one has thought on a subject, one cannot avoid forming some opinion.

What I wrote to Hooker I forget, after reading only a few sheets of your Memoir, which I saw would be full of interest to me.

Hooker asked me to write to you, but, as I told him, I would not presume to express an opinion to you without careful deliberation.

What he wrote I know not: I had previously several years ago seen (by whom I forget) some speculation on warmer period in the U.States subsequent to Glacial period; and I had consulted Lyell, who seemed much to doubt, and Lyell's judgment is really admirably cautious.

The arguments advanced in your paper and in your letter seem to me hardly sufficient; not that I should be at all sorry to admit this subsequent and intercalated warmer period--the more changes the merrier, I think.