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mcxntosh battery and optical co., Chicago, ill., u. s. a. 65 might be quite correct; but all Saturators wnicn are manufactured under our supervision (it is unlawful to use any others with a porous filling) will be found to operate so perfectly that it is only necessary to pass a very small portion of the oxygen through them, and the mixture will burn like house gas, without a particle of danger, and without the slightest irregularity. The details of construction were not settled upon until about a dozen shapes and sizes were tested in a most careful manner, with several different kinds of filling; it was found that while the form, size and arrangement finally adopted by the inventor would meet every possible requirement, some apparently insignificant deviations therefrom would make a saturator quite unre- liable and unsatisfactory for use with lime-light apparatus. Since coming into our hands we have experimented extensively with a view to still further improving both its safety and its efficiency. We have made some half dozen improvements suggested by prolonged experience in ivorking single and dissolving lanterns, and have no hesitation in pronouncing it, in its present form, superior in safety, convenience and quality of light produced, to hydrogen or any other substitute for it in the production of the calcium light in its perfection. J8®“ Any good oxy-hydrogen “ mixed-gas ” jet can be used, but those having a comparatively small aperture and a small mixing chamber are best. Oxygen may be supplied from either a bag, gas- ometer or cylinder, in the usual manner. The Mclntosh-Ives Ether Saturator is made in 3 sizes; 1, 2 and 3 tubes. PRICE No. 1, or smaller, consists of one cylindrical nickel-plated brass tube, having a diameter of 2 inches, and 13 inches in length, with a porous filling having a zig-zag channel cut into the center of the top ^4 of an inch in width, and of an inch deep, and about 25 inches in length, to allow the free pas- sage of oxygen gas. On the upper surface of each end is a stop cock with nipples for the attachment of the rubber connections and also for filling with ether. This No. 1 Saturator is an jm- provement on, and has been designed to supplant entirely, the No. 2; or 2 Tube Saturator, since from the peculiarity of its con-