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MCINTOSH BAT TERY AND OPTICAL CO., CHICAGO, ILL., 0. S. A. 23 an accessory to the Solar Combination, the optical parts being mutually interchangeable for the purpose of employing the calcium light when sun-light is not available. Two of these Stereopticons placed side by side make a very fine dissolving apparatus, as all the adjustments are perfect and firm, so that pictures can be accurately registered upon the screen without distortion, and without the constant motion, which is an undesirable feature of many forms of apparatus offered as first-class Dissolvers. MICROSCOPE ATTACHMENT. PRICE, with best quality 1% inch Objective $45.00 With second quality 1% inch objective $35.00 Without Objective $25.00 DESCRIPTION. K represents the body. | b. Screw for holding Frog Plate, etc. O, the Objective. s, Clips for holding Object Carrier. C, Coarse Movement. I c, Sub-Stage Ring. E, Flange cut in threads to fasten in Sliding Tube of Stereopticon. This Microscope Attachment is designed expressly for projection, and is supplied only with such working parts as are actually necessary. It has the Society Screw, which adapts it to most objectives of Amer- ican or English make, and also the broad Butterfield Gauge, which admits of using a very large prism for polariscope work. The sub- stage ring will receive Polariscope, Secondary Condenser, Mounted Prisms, and other accessories to experimental work, including all that can be used below the stage on the McIntosh Professional Microscope. The rack and pinion movement permits great delicacy in focusing. This attachment will be found very satisfactory to those using the microscope only for projection. We can furnish other objectives than those named when higher powers are wanted.