HI6HLEYS HOSPITAL MICROSCOPE. 



99 



useful when opaque objects are being viewed. The stage is per- 

 forated at one of its front corners with a hole, into which fits a 

 pair of stage-forceps (§ 66). The mirror, which is concave on 

 one side and plane on the other, is attached, not to the pillar, but 

 to a tube which slides upon it, so that its distance frona the under 

 side of the stage may be increased or diminished. The con- 

 denser for opaque objects is mounted on a separate stand (§ 64). 

 The simplicity of the constrfiction of this Microscope, and the 

 facility with which all those adjustments may be made that are 

 required for the purposes which it is intended to fulfil, should 

 constitute, with its low price, a great recommendation to those 

 who value a Microscope rather as a means of interesting recrea- 

 tion for themselves, or of cultivating a taste for the study of na- 

 ture and a habit of correct observation in the young, than as an 

 instrument of scientific research. It is not, of course, to be ex- 

 pected that it should bear comparison, in regard either to the 

 mechanical finish of its workmanship, or to the perfection of its 

 optical efiiscts, with Micro- 

 scopes of many times its cost ; *'■ 

 but it is infinitely superior to 

 the best Microscope ever con- 

 structed on the old (non-achro- 

 matic) plan ; and it is greatly 

 to be preferred in its mecha- 

 nical arrangements to any of 

 the earlier achromatic micro- 

 scopes, which it at least equals 

 in optical performance. 



32. Highley's Hospital Micro- 

 scope. — The scale of this in- 

 strument is somewhat larger 

 than that of the preceding, 

 and its workmanship more 

 finished and substantial. The 

 tripod stand, the stage and its 

 fittings, and the mirror, al- 

 most exactly resemble those 

 first described ; but the body, 

 which is longer, is supported 

 in a different manner. The 

 pillar to which the stage and 

 the mirror are attached, is pro- 

 longed upwards, and then 

 forms a kind of "limb," to 

 which is affixed a tube slit 

 down in front; and within 

 this tube the "body" slides up and down, with sufiicient freedom 

 to allow of being easily moved, yet with sufiicient stiffness to 

 remain firm in any position in which it may be left. In the sim- 

 ple form of this instrument here delineated, the sliding action 



Highley's Hospital JVIicroscope. 



