440 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
it the rectangular movements are im- 
parted by the micrometer-screws M 
which work in two of the prisms P. 
All this mechanism lies within the 
body of the graduated circle, and is 
protected from dust by the annulus D. 
The eccentric E clamps the circle, 
and B is the fine-adjustment of the 
same. 
The same arrangement can also be 
used with non-rotating stages. It is 
made by P. Brunnee, of the firm Yoigt 
and Hochgesang, of Gottingen. 
Lens-Support for Examining Seeds * 
— Herr C. Reichert briefly describes 
the lens-support shown in fig. 40, 
which has been made according to the 
designs of Dr. von Weinzierl for the 
examination of seeds. The arms c 
and c', carrying low-power lenses, are 
capable of horizontal and vertical 
movements, and are supported on a 
heavy base. 
The lens-support shown in fig. 41 is mentioned here. The lens slip 
* Zeitschr. f. angew. Mikr., iii. (1897) pp. 72-3 (2 figs.). 
Fig. 41. 
four prisms P' which move between the prismatic edges of the frame R 
and the four guides S'. The frame R is fixed to the stage T, and to 
Fig. 40. 
R^iCHtRT,.' WIEN. 
