THE MIcROScOPE. 199 
NEW STUDENT MICROSCOPE. 
Tue Bausch AND Lome Opricat Co. will soon put upon the 
market a new low-priced microscope for students. It is constructed 
on the principal 
of the concentric 
or rocking mo- 
tion of the arm, 
by which the 
instrument _ be- 
comes more firm 
the further it is 
inclined. It also 
has a new roller 
motion for the 
fine adjustment, 
the sliding-tube 
coarse adjust- 
ment, draw-tube 
and revolving 
diaphragm, fixed 
to a separate arm 
so that it can be 
swung out of the 
optical axis. The 
concave mirror is 
attached to a bar, 
the axis of which 
lies in the plane — = SS = ——— 
of the stage, so that illumination may be brought on the object 
from any point below or above the stage. The base and arm are 
japanned, the latter being fastened at any desired angle by means of 
milled heads in the pillars. Two special objectives,—a one inch 
15° and + inch 65°—the latter capable of resolving the lines on 
_P. Angulatum, are furnished with the instrument at a very low 
price, putting it at once within the reach of students and amateurs. 
Tue PALMER SLIDE Company OF GENEVA, N. Y., has sent us a 
number of their bevel-edged slides. Though not. exactly a new 
invention, it may be well to again call the attention of our readers 
