94 
PRACTICAL DIRECTIONS. 
CHAPTER V. 
PRACTICAL DIRECTIONS. 
121. Care of tlie ]TIicro§cope. It is of the first importance 
that every part of the microscope should be kept perfectly 
clean and free from dust. For this purpose a good case is re- 
quired, into which the instrument can be easily placed wdien 
not in use. In order that no unnecessary time may be lost in 
packing and unpacking, the upright case is more convenient, 
as the instrument can be placed in it nearly in the same condi- 
tion as when arranged for use. Each object-glass, when not in 
use, should be carefully returned to the brass box provided for it, 
as it is thus less likely to be injured by dust or other means than 
when attached to the microscope. The case should be arranged 
with proper fittings to hold all the apparatus belonging to the 
microscope. Two or three drawers are required to hold slides, 
thin glass, dissecting needles, &c. 
If the microscope gets soiled it may be wiped with fine linen 
or cambric. The lenses of the eye-piece may be wiped wdth 
soft buckskin which has been thoroughly freed from dust, but 
care should be taken that this operation may be required as 
seldom as possible. The object-glasses will lose their fine 
polish if often wuped. Some microscopists are so careful of 
their object-glasses that they do not require cleaning for years. 
If an object-glass requires cleaning it may be brushed with 
a fine short carners-hair-pencil which is used for no other pur- 
pose, or it may be moistened by breathing on it and then 
gently pressed with soft buckskin. When fluids are used 
about the microscope, care should be taken to avoid wetting the 
object-glasses. If this accident happens, they must be wiped 
dry with the buckskin. 
In handling the object-glasses, care should be taken to avoid 
touching the surface of the lenses. The glasses should be 
examined when returned to the case to see if they have been 
soiled. Too great precaution cannot be taken to keep every- 
thing about the microscope scrupulously clean. 
J. & W. GRUNOW & GO’S ILLUSTRATED 
