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96 being obscure. The diagrams are selected with taste, and the engraving and typography, especially that of the tables, are worthy of the highest praise.

Such, we think, are the merits of the work before us—merits which, it must be admitted, are of the first importance in a book designed for a practical manual. To attain them required the exercise of a discriminating judgment, guided by a thorough acquaintance with all the points in natural science which are of interest to seamen.

There are particulars in the work which we think objectionable, but they are of minor importance, and would probably be regarded as scarcely deserving criticism.

The spirit of literary improvement has been awakened among the officers of our gallant navy. We are pleased to see that science also is gaining votaries from its ranks. Hitherto how little have they improved the golden opportunities of knowledge which their distant voyages held forth, and how little have they enjoyed the rich banquet which nature spreads for them in every clime they visit! But the time is coming when, imbued with a taste for science and a spirit of research, they will become ardent explorers of the regions in which they sojourn. Freighted with the knowledge which observation only can impart, and enriched with collections of objects precious to the student of nature, their return after the perils of a distant voyage will then be doubly joyful. The enthusiast in science will anxiously await their coming, and add his cordial welcome to the warm greetings of relatives and friends.