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readers of the are aware that the various volumes of the series hitherto devoted to Entomology, have been occupied with the elucidation of particular Orders and Families. The volume which we have now the pleasure of presenting to their notice, contains a general exposition of all the Orders, the predominance being given to those which were not previously noticed. Ample details of external structure, of the anatomy and physiology of the class insects, of the modes of systematic arrangement, &c. have likewise been given, in order to render it a complete introductory view of the entire subject. Our entomological series, therefore,—already amounting to six volumes,—affords a pretty full and profusely illustrated view of this interesting department of zoology, one eminently calculated to gratify the laudable curiosity of those