The increasing popularity of the Marine Aquarium demands a Handbook of Practical Instructions for establishing and maintaining it, and I am probably the most proper person to write it. Perhaps it might have been sufficient to refer inquirers to my volume on the subject; but the price of that work, arising mainly from the costliness of its illustrations, puts it beyond the power of many persons, who yet desire to keep marine animals. The main portion of that volume is, moreover, occupied with the habits and manners of the tenants in an Aquarium.<br><br>The concluding chapter of that work has formed the ground of the present Handbook. The whole, however, has been re-written, and copious additions have been made, bringing it up to the present state of our experience. The price at which it is issued will, it is hoped, bring it within the reach of all.