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xx views of later Naturalists; but, owing to the illness of Dr Leach, by whom the earlier parts of the plan were executed, it has not been completed in all its extent. Some of the later heads, undertaken by him, have been treated by the Reverend Dr Fleming; and, besides the systematic articles, a few of a more popular kind have been contributed by Dr Roget.

That great branch of descriptive science, which, under the name of Physical Geography, draws its materials from all the various divisions of Natural History, in order to present a systematic view of the globe, its productions and inhabitants, is here treated, in a compendious form, by Mr Maclaren; to whom the work is indebted for some very valuable contributions in the department of Statistics.

Medicine, and the sciences subservient to that study, have been duly attended to in the formation of the work. Under Anatomy, there is a new outline of the subject, written by the late Dr Gordon. Physiology is fully treated in the Encyclopædia, in as far as concerns the principal facts relative to the functions of animal life; but there seemed to be wanting a comprehensive view of the general laws to which they are reducible; a defect which has been ably supplied, in this work, by Dr Roget. The progress made of late years in the important art of Surgery, and some modes of practice omitted in the Encyclopædia, are detailed, in a supplemental article, by Mr Cooper; and the present state of opinion, in the medical world, with respect to Vaccination, will be found in the article under that head. Other three articles upon the subjects of Bathing, Dietetics, and Food—the first by Dr Young, the two last by Dr Duncan, junior, complete the list of contributions in this department.

A number of articles have been assigned to the extensive department of Arts and Manufactures; and, though some of them refer to the Encyclopædia for such details as did not require any material alteration, the greater part may be described as complete treatises on their respective subjects. A simple enumeration of the more important will, therefore, suffice for the present purpose.

Among those relative to the Mechanical Arts and Manufactures are, Anchor-making, Assaying, Blasting, Block-Machinery, Boring, Brass-making, Cannon-making, Carpentry, Coining, Cotton-manufacture, Cutlery, Joinery, Iron-making, Lithography, Printing, Road-making, Steel Plate Printing, and Stone-Masonry,