it not been for the liberality of the Lords Commissioners of Her
Majesty's Treasury, who, through the representation of the Right
Honourable the Chancellor of the Exchequer, have been pleased
to grant a sum of one thousand pounds towards defraying part
of the expenses of publication.

I have myself published separate volumes on the 'Structure
and Distribution of Coral Reefs;' on the 'Volcanic Islands
visited during the Voyage of the Beagle;' and on the 'Geology
of South America.' The sixth volume of the 'Geological
Transactions' contains two papers of mine on the Erratic
Boulders and Volcanic Phenomena of South America. Messrs.
Waterhouse, Walker, Newman, and White, have published several
able papers on the Insects which were collected, and I trust
that many others will hereafter follow. The plants from the
southern parts of America will be given by Dr. J. Hooker, in
his great work on the Botany of the Southern Hemisphere. The
Flora of the Galapagos Archipelago is the subject of a separate
memoir by him, in the 'Linnean Transactions.' The Reverend
Professor Henslow has published a list of the plants collected
by me at the Keeling Islands; and the Reverend J. M. Berkeley
has described my cryptogamic plants.

I shall have the pleasure of acknowledging the great assistance
which I have received from several other naturalists, in the
course of this and my other works; but I must be here allowed
to return my most sincere thanks to the Reverend Professor
Henslow, who, when I was an undergraduate at Cambridge, was
one chief means of giving me a taste for Natural History, --
who, during my absence, took charge of the collections I sent