PHYSIOLOGY 



^TJJE LABORATORY. 



c. The artfu cllle arm is attached to the upper part of 

 the pillar and supports the parts, d and e, of the micro- 



i --mmm sc P e ( Fi - ! c )- 



d. The body. This is the 



short outer tube upheld by 

 the arm (Fig. 1, d). 



e. The draw-tube. This is 

 the long tube within the body 

 to which the objectives and 

 the eyepieces are attached. It 

 is called the draw-tube, be- 

 cause in some microscopes it 

 can be lengthened and short- 

 ened to change the magnifica- 

 tion (Fig. 1, e). 



f. The stage. This is the 

 part attached to the pillar, 

 below the body, on which the 

 slide that is to be examined is 

 placed (Fig. 1, /). 



g. The diaphragm. Attached 

 to the lower side of the stage 

 is a circular piece, the dia- 

 phragm. It contains open- 

 ings of different sizes and 



the 



one of the desired size may 

 be brought under the opening in the centre of the stage 



(Fig- 1, 9)- 



h. The clips. These are the two small metallic pieces, 

 one on either side of the stage, to hold in place the slide 



FIG. 1. The compound microscope. 

 a, foot ; 6, pillar; c, arm ; d, body; e, 

 draw-tube ; /, stage ; g, diaphragm ; 

 h, clips ; i, mirror ; k, milled head 

 for fine adjustment; I, eyepiece; may be turned SO that 

 m, objective. 



