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nite idea of the subject. For this reason, a table of contents is appended to the work, as well as an alphabetical index; the one to enable the reader to form a general conception of the subject, and the other to enable him to find out any particular creature.
On perusing the work, the attentive reader will probably discover that various animals are placed in one class when they might very well be in another. The reason is, that many creatures, such as the wasp, the ant, the squirrel, etc., might with equal propriety find a place in several of these classes, and I bave therefore placed them in that class of which some peculiarity in nest-making renders them fit illustrators. ,
I must now return my thanks to the many friends who have assisted me in the work, by the loan or gift of specimens, or by affording valuable information. Among them I must especially mention J. GOULD, Esq., who kindly took an interest in the ornithological portion of the work; F. SMITH, Esq., of the British Museum; and the late CHARLES WATERTON, Esq., who permitted me the use of his museum, and gave me much interesting and useful information.