580 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
MICROSCOPY. 
a. Instruments, Accessories, &c.* 
Cl) Stands. 
Hew Preparation Microscope.^ — Drs. H. Braus and L. Driiner have 
devised a new form of preparation Microscope which has been made for 
them by the firm of Zeiss. 
The first instrument made is represented in fig. 82. For base it 
Fig. 82. Fig. 83. 
has a heavy rectangular metal plate (see fig. 82). Screwed into this is 
a hollow upright a in which a metal rod b, 18 cm. long, slides vertically, 
and can be clamped at any height by means of the screw c. This rod 
carries a socket, with clamping screw d, which clasps a second horizontal 
rod e (compare fig. 83), 28 cm. long, with the end of which a short metal 
rod / is connected by means of the joint g. The optical instrument is 
attached to the rod / by a second clamping socket h. 
The Microscope consists of a short body-tube (9 cm.) provided with 
a rack and pinion i. The inversion of the image is etfected by an 
inverting eye-piece 1c. 
The instrument has the following advantages over the Briicke 
lens : — 
(1) A fine and certain adjustment by the pinion which is in close 
proximity to the hand. 
(2) The coarse-adjustment is possible in all directions after loosening 
the fixing screws. 
* This subdivision contains (1) Stands ; (2) Eye-pieces and Objectives ; (3) Illu- 
minating and other Apparatus; (4) Photomicrography; (5) Microscopical Optics- 
and Manipulation ; (6) Miscellaneous. 
f Jena. Zeitschr. f. Naturw., xxix. (1895) pp. 135-42. 
