takes the most practical turn, has adopted this plan of construction, and strongly recommends it for every vessel intended for the reception of marine stock. Where it is desired to stock a vessel, in which the back plate is composed of colourless glass, with marine products, a substitute for coloured glass will be found in diaphanie; but the paper chosen for the purpose should be of the lightest shade of sea green, because it is less transparent than stained glass. In stocking vases, this plan of staining the side, next the window, is to be strongly recommended, no less for securing a healthy vegetation than of enlivening the beauty of the collection. I have used for this purpose, the paper and varnish prepared by Messrs. Faudel and Phillips, of Newgate Street, and can commend it for cheapness, and the ease with which it can be applied.
Another point deserving, of note is, that marine aquaria need a less depth of water than river collections:—For purposes of study, a number of glass dishes or milk-pans, will be found preferable to any kind of tank, or vase, especially for Zoophytes, though fishes and crustaceans require more room than mere bowls would afford them. In fact, the lower forms of marine life may be kept for many months without the help of sea weeds, if placed in shallow vessels—the absorption of oxygen, at the surface, being quite equal to their demand upon the water.
In all other respects, what has been already said on the subject of vessels must be understood to apply to all kinds of aquaria; the rectangular tank, and the bell glass, are the two leading forms, and to them I shall always refer when speaking of the tank in a general sense.
