100 THE MICROSCOPE. 



and the highest objective can be used with equal 

 advantage, has been adapted by Mr. Baker to a micro- 

 scope stand (fig. 54), well suited for laboratory use, and 

 for many practical purposes. It is superior to the 

 ordinary dissecting microscope; the erecting principle 

 renders it generally serviceable, as, for example, in 

 selecting and arranging shells, and in the proper dis- 

 position of specimens in the process of mounting. 



The double bodies are attached by an arm to a rack- 

 work of unusual length, suspended, as it were, over a 

 stage 6 in. X 3 in. in the horizontal position ; it has the 

 usual double mirror of large size, the whole being sup- 

 ported by three solid uprights to a heavy base. The 

 figure scarcely does the instrument justice ; it fails to 

 show the second body. 



Browning's (63, Strand) Rotating Microscope (fig. 55) 

 is well adapted for pathological work. It has a circu- 

 lar glass sunk in to the stage, and is consequently not 

 likely to be damaged by moist preparations. The utility 

 of a turning-stage, as already explained, gives the com- 

 mand of varying the position and illumination of the 

 object to be examined. In the construction of this in- 

 strument this fact has been kept in view; the stage and 

 the eye-piece revolving together on thp same axis ; and 

 the image remaining in the field of vision during the 

 whole revolution. The microscope stand aims at com- 

 bining, in the simplest and least expensive form, the 

 high qualities of the best English models. 



Browning's Complete Binocular has a well-finished 

 stand, with the latest improvements, mechanical mo- 

 tions to stage, secondary stage, with removable fittings, 

 etc., and is, in every respect, a complete instrument. 



Watson's Microscope Stand (fig. 56) presents points of 

 novelty, the most notable among which is the inclining 

 motion of the limb, carrying the optical body and stage 

 on an axis in a line with the object on the stage. By 

 the simple inclination of the limb, varying effects of 

 oblique illumination can be obtained direct from the 

 mirror, which can be attached for this purpose to the 

 centre of the base, and is then independent ot the 

 inclination of the limb. 



