REVIEW?. 
31 
Fig. 2. 
Fig. 3. 
In the compound microscope the mechanical parts may be divided into 
two parts —the stand and the body. “ The stand is usually composed of a 
tripod, with two upright 
pillars; between these 
pillars is a bent bar, 
which works in a joint; 
the bar carries at one 
end the compound body, 
to which the object- 
glass and eye-piece are 
attached, and at the 
other end the stage and 
mirror. The body con¬ 
sists of a long brass 
tube, which carries the 
object-glass at one end 
and the eye-piece at 
the other ; the object- 
glasses are screwed on 
to the body, but the 
eye-pieces are attached 
by their own tubes, 
which slide into the 
tube of the body.” 
u The stage consists of 
a plate of brass, hav¬ 
ing another plate of 
brass, called the object- 
plate, fitted to it, and 
made so as to slide up 
and down upon it; the 
object-plate has a raised 
edge, at the lower end, 
for supporting the object when the instrument is inclined.” In^thejnore 
expensive instruments the object-plate is made to move in different direc¬ 
tions Jiy screws with milled heads. Quekett’s dissecting microscope is 
occasionally arranged as a travelling compound body. (See next page, 
fig. 4.) 
The accuracy with which observations can be made depends on the skill 
of the observer and the quality of his object-glasses. The ease with which 
