680 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
(fig. 102). The ends of the stand fold downwards on the central 
joint c. 
The whole of the above was contained (with the stand) in a compass 
of 7 X 4 X If in. 
For use with this apparatus the lens-carrier of Baker’s Tank Micro- 
scope was well adapted, as it can be clamped to a table edge, has rack- 
and-pinion adjustment, and a long jointed arm, which is here partly re- 
placed by a ball-jointed arrangement. 
The position of the lens-carrier should be at right angles to the 
dissecting-stand, and not as in the figure, where it is shown for con- 
venience in illustration. 
For dissecting with higher powers, a small Microscope can be 
placed between the hand-rests, for which purpose the base of the appa- 
ratus has been recessed to receive the feet of such an instrument. 
(4) Photomicrography. 
New Photomicrographic Apparatus.* — Dr. E. Czaplewski has sought 
to combine in this apparatus great stability with ease of adjustment 
and convenience of regulation of the illumination. A feature of the 
apparatus is that the Microscope is enclosed in a box so as to be pro- 
tected from all extraneous light. 
A heavy wooden plate, weighted with lead and supported on four feet, 
serves as base-plate. On this rise two side walls, 47 cm. high, 4 cm. 
thick, 28 cm. wide and 28 cm. apart, between which the Microscope 
stands. On the inside of these side-walls and projecting above them 
are two iron plates, 60 cm. long, 6 cm. broad, and 7 mm. thick, which 
serve to support the upper part of the apparatus. 
In front, the two side walls are connected together by a wooden plate 
in which is an aperture 6 cm. in diameter, for the admission of light. 
This can be closed by a side shutter, sliding in a frame and having a 
large round opening of 7 cm. The frame carries a horseshoe groove, in 
which ground or coloured glasses can be placed. In one position of the 
shutter, all light is cut off from the Microscope. The apparatus is 
closed behind by a door. In the base-plate, holes are cut for the feet of 
the Microscope, so that the latter may always occupy the same position. 
The photographic part of the apparatus is made as light as possible. 
The camera-bag is 22 cm. in length when drawn out ; its upper aperture 
is about 10 cm., while underneath, it carries a brass socket of 3*2 cm. 
aperture, which fits over the eye-piece of the Microscope. The camera- 
bag fits into a corresponding opening in a plate, 36 cm. X 28 cm., which 
forms a cover for the box enclosing the Microscope. This cover-plate 
slides in the iron plates attached to the side walls, and can be adjusted 
in height and fixed by a clamping screw. 
In order that the body-tube of the Microscope shall not be pressed 
by the weight of the camera-bag, the latter is supported by two bars 
attached to the cover-plate, and has grooves in which slide two pro- 
jecting pieces from the lower plate of the camera-bag. By means 
of a screw, the lower plate can be fixed in any position on the bars. The 
arrangements for the light-proof connection of Microscope and camera- 
bag consist of a double socket similar to that in Zeiss’ apparatus. 
* Zuit&elir. f. wiss. Mikr., xiii. (1896) pp. 117-56. 
