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12 hall's illustrated catalogue of as lie can remain at the lantern, and the pointer will be seen on the canvas. Tin's instrument is especially adapted for schools and educational institutions, fitted with argand gas, or Hall's Imperial Round Wick Coal Oil Burner. Price, $50. No. !ยป can either be illuminated with argand burner, and with common house gas, or with Hall's Improved Coal Oil Burner. No. 10. Educational Stereopticon, fitted with Hall's Latest Im- proved Concentrated Safety Jet Oxy-Hydrogen Blow Pipe, with Lime Holder. India-rubber gas bag 40 inches long by 30 inches wide, with brass stop-cock, 12 feet gum tubing and press boards for the oxygen gas ; copper retort and metal pipe for making oxygen gas, tin spirit lamp for heating the retort, iron retort stand, glass wash bottle with brass screw top ; copper gasometer and generator 11 inches in diameter and 24 inches high, for making hydrogen gas ; 8 feet gum tubing, 1 dozen lime cylinders, all packed in neat wooden boxes, with lock and key, and handles. Price, $80.00. No. 11. Educational Stereopticon, without the India-rubber gas bag, gum tubing, press boards, copper retort and metal pipe, spirit lamp, wash bottle, retort stand, hydrogen gasometer and gene- rator, dissolving. Price, $75. No. 12. Educational Stereopticon, oiled walnut case 12 inches long by 9 inches wide, and 12 inches high, extra tine condensing lenses 6^ inches in diameter, two very finest achromatic magnifying lenses 2 inches in diameter, giving high and low power, with brass rack adjustment for focusing ; latest improved concentric safety jet oxy-hydrogen blow pipe with lime holder; India-rubber gas bag 40 inches long by 30 inches wide, with brass stop-cock, 12 feet of gum tubing and press boards for the oxygen gas, copper retort and metal pipe for making oxygen gas, tin spirit lamp for heating the retort, iron retort stand, glass wash bottle with brass screw top : copper gasometer and generator 11 inches in diameter by 24 inches high, for making the hydrogen gas, 8 ieet gum tubing, 1 dozen lime cylinders, all packed in neat wooden boxes, with lock and key, and handles. Price, $150.