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51 MCINTOSH BATTERY AND OPTICAL CO., CHICAGO, ILL., U. S. A. MCINTOSH NEW CLINICAL MICROSCOPE NO. 1. Price, with one eye-piece, in case, no Objective $20.00 Price, with one eye-piece, in case, one-fourth, one-half, and one inch Students’ Dividing Objective, giving 100, 200 and 350 diameters.... 28.00 Price, with one-fourth and one inch Objective, giving 100 and 500 dia- meters 32.00 MCINTOSH NEW CLINICAL MICROSCOPE No. 2. With Rack and Pinion Movement. Price, with one eye-piece, in case, no Objective 25.00 Price, with one eye-piece, one-fourth, one-half and one inch Dividing Students’ Objective, giving 100, 200 and 350 diameters 33.00 Price with one-fourth and one inch Dividing Objective, giving 100 and 500 diameters 37.00 SCIENTIFIC MICROSCOPE NO. 1. Price of stand with one eye-piece (no objective) 35.00 Price with one eve-piece, and one-fourth and one inch Dividing Objec- tive :... 47.00 SCIENTIFIC MICROSCOPE NO. 2. Price, with one eye-piece (without objective) 45.00 Price with one eye-piece and one-fourth and one inch Dividing Objec- tive 57.00 For further particulars send for our Microscope Catalogue. EYE PIECES. Our Eye Pieces are of the form shown in the engraving, and are care- fully constructed. They give a large, flat field, and are designated by numbers according to the equivalent foci of the lenses. The draw-tubes of our micro- scopes are all of the same diameter, there- fore the Eye Pieces are interchangeable. We furnish them to order, with a slot to receive a micrometer. We furnish solid Eye Pieces of best quality, mounted, for $6.oo each. Periscopic Eye Pieces con- sist of a triple eye lens and double con- vex filed lens, having a large, flat field, m showing a sharply defined image to the extreme edge. We can furnish them from $10.00 to $24.00 each. directions for ordering EYE PIECES. The best method of giving the exact measure is to wind a strip of writing paper about the tube and trim it off so that the two ends just meet.