I had formerly gathered from Lyell that the relative position of the Megatherium and Mylodon with respect to the Glacial deposits, had not been well made out; but perhaps it has been so recently.

Such are my reasons for not as yet admitting the warmer period subsequent to Glacial epoch; but I daresay I may be quite wrong, and shall not be at all sorry to be proved so.
I shall assuredly read your essay with care, for I have seen as yet only a fragment, and very likely some parts, which I could not formerly clearly understand, will be clear enough.
LETTER 348.

TO J.D.HOOKER.

Down, [December] 26th, [1859].
I have just read with intense interest as far as page xxvi (348/1.

For Darwin's impression of the "Introductory Essay to the Tasmanian Flora" as a whole, see "Life and Letters," II., page 257.), i.e.to where you treat of the Australian Flora itself; and the latter part I remember thinking most of in the proof-sheets.