The Microscope-stand. 19 



E is the stage on which the ohject is placed. 



F is the limb carrying the body (G). 



At the lower end of the body is a screw, into which the 

 objective (H) is fitted. 



At the upper end of the body is a sliding fitting called the 

 draw-tube (J), by means of which additional magnification 

 may be obtained, and into this draw-tube the eyepiece or 

 ocular (K) fits. 



L is a rackw r ork, by means of which the body (G) is raised 

 and lowered in order to focus the objective (H) upon the 

 object which is placed on the stage (E). 



M is the milled head controlling the fine adjustment, 

 which imparts a delicate motion to the body, in order that 

 the objective may be more exactly adjusted than would 

 be possible with high magnifying power with the rack- 

 work (L). 



N is a fitting for forceps, or side silver reflector ; and 

 are the springs with which the object is held in position. 



We have selected the instrument (Fig. 2) as, from prac- 

 tical acquaintance with it, we are able to strongly recommend 

 it for a beginner's microscope, worthy of receiving additions 

 from time to time as means may permit, especially as it 

 may be had on a tripod form of foot similar to that shown 

 in Fig. 1, instead of the horseshoe form. Still, it should be 

 only considered as a typical one. 



THE FOOT. 



We would very strongly advise the beginner to purchase 

 an instrument with a tripod foot, as shown in the instru- 

 ment Fig. 1 (frontispiece). This is the most rigid form of 

 foot in the market, and is in this respect a long way in 

 advance of the horseshoe stand with a single pillar, so 

 largely adopted on the Continent. 



If the horseshoe foot be made in proper proportion, it is 

 not so condemnable ; but unfortunately it rarely is, and at 

 the best is not nearly so firm as the true tripod foot recom- 

 mended. This is a most important feature; and though 



