This is an aerated water apparatus, introduced by Messrs. Gaillard & Dubois, of Paris. The main ieatures of this arrangement consist in the employment of three distinct chambers, or receptacles, one being for the water to be aerated, a second to contain the effervescing powders, and a third to retain a small quantity of pure water, which, after the apparatus is closed, is allowed to fall upon the powders, thereby causing the evolution of the carbonic acid gas. This figure represents one modification of this ingenious apparatus. The water, or other liquid to be aerated, is contained in a glass bottle, A, of elegant shape, and formed with a wide cylindrical neck, to which a metal collar piece, B, is ce- mented. This collar is bored out to receive the long cylindrical vessel, C, like a chemical test tube in shape, supported by a metal ~..a " ""=o i"'lud'cuuoi, L. jiuove the collar, B, is bored out conically, to receive a conical lid, D, which is screwed down by the cap-piece, E, the joint being rendered hermetic by the introduction of a ring of leather or caoutchouc, between the conical surfaces. The lid, D, has a central opening, into which is cemented the small glass vessel, F, resembling a hollow stopper from its shape and position. It is fitted with a conical plug, the spindle, G, of which passes through a small stuffing box at the top, and has a button attached outside. The stuffing employed is a disc or washer of leather or caoutchouc, which is compressed by the screw-cap. H Into one side of the collar, B, is screwed a species of siphon cock, I, consisting of a plug valve, opened by the pressure of the finger on the external button, J, and closed by the action of a helical spring. The passage of this valve communicates with a tube, K, of small bore, reaching nearly to the bottom of the vessel, A. On the opposite side is another similar tube, L, descending to a like depth, and terminating above in a small rose, and in communication with the vessel, C, in which the "as is evolved. The manner of proceeding in isingthis apparatus is as follows :—The cap, E, is unscrewed, and the three vessels are separated, when the largest, A, is filled to near-y seven-eighths ot its capacity with the li-quid to be aerated. The bicarbonate of soda and tartaric acid, or other powders for producing the gas, are now put into the tubular vesssl, C, which is then put into its place in the vessel, A. The vessel, G, is next filled with pure water, and the plug being tightly closed, it is placed in position, and the whole screwed together again. When it is wished to set the matters in action, the plug spindle G, is depressed, and the water descends upon, the effervescing powders, and the gas evolved in consequence finds its way by the tube, L, to the water below, impregnating it and nassing through it, so as to exert a pressure on its surface, which, when the cock, I, is open, torces it up through the tube, K, and out by the spout, M, into the glass, N, placed to receive it.