102 THE MICROSCOPE. 



ship, suitable for all ordinary investigations, well deserving 

 a place among cheap microscopes for the student. The 

 stand is of brass, firm and well finished; the body is 

 fitted with coarse and fine adjustments for focussing ; and 

 a draw-tube for increasing the magnifying power of the 

 eye-piece. The stage has an arrangement, simple but 

 novel in construction, by which a near approach to a 

 universal movement is obtained. The moveable, or upper 

 plate, is held to the fixed lower plate with springs, and, 

 although ofiering a convenient resistance, allows of a 

 smoothness of motion quite remarkable. It resembles 

 the magnetic stage, but is far more reliable, and can be 

 moved upwards, downwards, laterally, or in a slanting direc- 

 tion, thus enabling the microscopist to follow living objects 

 with great facility, superseding to some extent the more 

 expensive mechanical stage. A dividing set of object- 

 glasses is supplied with the b eye-piece, thus giving a 

 range of power varying from 40 to about 200 diameters. 

 His powers are of English workmanship, but difi'er from 

 the higher-priced objectives in having smaller angular 

 apertures, which is, perhaps, a legitimate mode of lessening 

 the cost. The instrument being made with the universal 

 screw, other objectives of a better class can be added at 

 any time. There is also a condenser mounted on a brass 

 stand for the illumination of opaque objects. The whole 

 is fitted in a mahogany case, with drawer for objects, and 

 sold at 51. 5s. 



Murray and Heath's (Jermyn Street) Student's Micro- 

 scope (fig. 57) is a good solid form of instrument with a 

 bent tripod-stand. The great object of furnishing a stand 

 at a low price which shall be capable, if desired, of being 

 adapted to the use of the higher objectives, and fitted for 

 the addition of all accessory apparatus, has been very 

 satisfactorily carried out and obtained in this microscope. 

 The stand is remarkably firm, and, being bronzed over, is 

 well adapted for daily use in the class-room or laboratoiy. 

 The adjustment is effected by a chain-movement, which 

 gives sufficient delicacy for powers up to the J inch. The 

 stage is perfectly flat, and the slide-rest moves smootlily 

 and freely over it. If the instrument is intended for use 

 in the laboratory, a glass stage is made to replace the brass 



