ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
217 
mechanical stage. The object is moved from side to side by the milled 
head s ; s, acting as a lever, also enables the object to be moved from top 
to]bottom of the stage. 
Fig. 49. 
111 1 
r ' Reichert’s Cheap Stand. — Fig. 50 shows [a stand called No. VII. by 
this firm. It is said to be an excellent stand for many purposes, for 
medical, botanical, and other students, and for examination of meat for 
trichinse. It is not inclinable — no disadvantage for some work — and 
Reichert strongly recommends it to those requiring a low-priced instru- 
ment. The coarse adjustment (not shown in figure) is by rack-and- 
pinion, and the fine by micrometer screw on Roberval’s principle. It 
has a large round stage and a plane and concave mirror. If a sliding- 
tube coarse adjustment is substituted for the rack-and-pinion, a further 
economy is introduced. 
Price, with rackwork coarse adjustment, 21. 10s.; with sliding-tube 
coarse adjustment, but without mechanical stage, as in fig. 50, 11. 14s. 
Folding Dissecting Microscope. — Messrs. Bausch and Lomb’s instru- 
ment bearing this name (fig. 51) is compact and portable. It has all the 
elements of the ordinary dissecting Microscopes, and besides these, the 
important feature that, when folded, it is brought into a very small 
compass. The base is japanned iron. The stage is of brass, blackened ; 
it has spring clips and, in its centre, a removable glass disc with milli- 
metre scale ruled upon it. It is of convenient height, so that any amount 
of work may be done without fatigue. The arm holding the lenses is 
adjustable in the triangular rack-rod, and has the Society’s screw, thus 
permitting the use of low-power objectives as simple magnifiers. The 
mirror is detachable from the base, and can be readily attached to the 
stage for illumination of opaque objects. In folding, the rack is brought 
down and the arm detached ; the stage swings backward on the pillar 
and the base on the stage, so that the space occupied is merely the size of 
the base and thickness of base, stage, and arm. 
1899 
Q 
