1665. Queen's Student's Microscope. This stand has been designed and constructed by us especially to meet the wants of students and profesaional men, combining, with excellent workmanship, most of the advantages of the more elaborate instruments, at less than one-third of their cost. The very highest powers may be used with it perfectly. Its height is 14 inches. The base and arm are of iron, finished in ligbt-green bronze; whilst the body and all other parts are of brass of the very highest finish. The coarse adjustment is of an entirely novel construction, working with entire smoothness; fine adjustment by micrometer screw; movable glass stage, beneath which a tube is fitted for carrying the diaphragm and accessory illuminating apparatus; concave and plane mirrors, arranged for direct and oblique illumination, fitted with Society Screw. Price of stand with one eye-piece, draw-tube, two object glasses Number 0 {1 inch), and Number 0 (1/4 inch), giving powers from 60 to 250 diameters, condensing lens on separate stand, a glass slip, with ledge and ccovers, for the examination of objects in fluid, needles, stage forceps, and brass pliers, packed in a handsome polished walnut cabinet, with good lock and brass handles. Price...$65.00