Here his scientific knowledge, successfully cultivated during a residence of nearly twelve years in Ceylon, and his intimate familiarity with its zoology and productions, rendered his co-operation invaluable;--and these sections abound with evidences of the liberal extent to which his stores of information have been generously imparted.
To him and to Dr.CAMERON, of the Army Medical Staff, I am indebted for many valuable facts and observations on tropical health and disease, embodied in the chapter on "_Climate_." Sir RODERICK I.MURCHISON (without committing himself as to the controversial portions of the chapter on the _Geology_ and _Mineralogy_ of Ceylon) has done me the favour to offer some valuable suggestions, and to express his opinion as to the general accuracy of the whole.
Although a feature so characteristic as that of its _Vegetation_ could not possibly be omitted in a work professing to give an account of Ceylon, I had neither the space nor the qualifications necessary to produce a systematic sketch of the Botany of the island.

I could only attempt to describe it as it exhibits itself to an unscientific spectator; and the notices that I have given are confined to such of the more remarkable plants as cannot fail to arrest the attention of a stranger.

In illustration of these, I have had the advantage of copious communications from WILLIAM FERGUSON, Esq., a gentleman attached to the Survey Department of the Civil Service in Ceylon, whose opportunities for observation in all parts of the island have enabled him to cultivate with signal success his taste for botanical pursuits.

And I have been permitted to submit the portion of my work which refers to this subject to the revision of the highest living authority on Indian botany, Dr.
J.D.HOOKER, of Kew.
Regarding the _fauna_ of Ceylon, little has been published in any collective form, with the exception of a volume by Dr.KELAART entitled _Prodromus Faunae Zeilanicae_; several valuable papers by Mr.EDGAR L.
LAYARD in the _Annals and Magazine of Natural History_ for 1852 and 1853; and some very imperfect lists appended to PRIDHAM'S compiled account of the island.[1] KNOX, in the charming narrative of his captivity, published in the reign of Charles II., has devoted a chapter to the animals of Ceylon, and Dr.DAVY has described the principal reptiles: but with these exceptions the subject is almost untouched in works relating to the colony.

Yet a more than ordinary interest attaches to the inquiry, since Ceylon, instead of presenting, as is generally assumed, an identity between its _fauna_ and that of Southern India, exhibits a remarkable diversity of type, taken in connection with the limited area over which they are distributed.