ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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The stage has an aperture of 35 mm. diameter, and a smaller diaphragm 
can be laid over it if wished. A blackened disc e shuts off or admits 
light when photographing. A tabic of the focal lengths of the lenses 
used, amplifications, times of exposure, &c., is given. 
Hand-Microscope.* — The accompanying fig. 22 represents a Hand- 
Microscope made by C. Reichert; it is simpler and more convenient 
than many other demonstration instruments to be handed round in an 
audience. The tube slides easily in the sleeve, and, if necessary, can be 
replaced by another giving higher magnification. The extension of the 
stage is for carrying a drawing of the object shown. 
Stand and Illuminating Apparatus for Opaque Objects.f — HerrC. 
Reichert describes the instrument shown in fig. 23. The stand, with 
coarse and fine adjustment, is hinged to the heavy foot ; the stage is of 
white glass, with a white background. Light passes through the tube 
* Zeitschr. f. angew. jMikr., iii. (1897) pp. 44-5 (1 fig.). 
t Tom. cit., pp. 40-1 (1 fig.). r ihe same instrument is also described by Prof. 
A. Rejto, Zeitschr. f. wiss. Mikr., xiv. (1897) pp. 1-4 (1 fig.). 
