•536 SUMMARY OF CURRENT RESEARCHES, ETC. 
Zeiss, and the eye-piece his projection No. 3. An amplification of 1000 
times was employed. 
Most of the photographs were made from preparations stained with 
a simple aqueous solution of fuchsin. A yellow screen, prepared by 
coating a plate ol glass with a film of negative varnish in whicli 
tropaeolin had been dissolved, was placed at the back of the achromatic 
condenser. Orthochromatic plates manufactured by Carbutt of Phila- 
delphia w r ere used. 
The arrangement of the apparatus is seen in fig. 74. A is the 
camera, with pyramidal bellows front supported by the heavy wooden 
Fig. 74. 
block B, whicli can bo pushed back so as to enable the observer to place 
his eye at the eye-piece of the Microscope ; G is the large Powell and 
Lealand stand, and D the Abbe condenser supported upon the substage ; 
E is a thick asbestos ^screen for protecting the Microscope from the heat 
of the gas-battery F. $ 
The gas-burners are arranged in a series with the flat portion of the 
flame facing the aperture in the asbestos screen. The light is reflected 
in the right direction by the concave mirror G. The focusing is effected 
by means of the rod I, which carries at one extremity a grooved wheel H, 
connected by a cord with the fine-adjustment screw of the Microscope. 
The focusing-wheel J may be slipped along the rod I and retained in 
any required position by a set-screw. 
To avoid oscillations, soft rubber cushions were placed under the 
whole apparatus. 
'Reichert’s New Photomicrographic Apparatus.* — This apparatus 
can be used with the highest magnifications either in the vertical (figs. 
75 and 76) or horizontal (fig. 77) position. For use in the horizontal 
position with very high magnification, the object is first adjusted in the 
Microscope as in fig. 76, and then the apparatus is reversed as seen in 
fig. 77. The light-proof connection between Microscope and camera is 
effected by the socket Y and the adjustable connecting piece F. The 
final correction of the fine-adjustment is effected by means of the string, 
* Keicherts Catalogue No. 18 (1892). 
