620 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
Koristka Microscope.* — The stand represented in fig. 59 was con- 
structed according to the design of Prof. C. Giacomini, for the examina- 
tion of the interior of the human brain. The square stage, of 16 cm. 
width, can be enlarged by the addition of two lateral wings, each 40 cm. 
long, so that preparations of more than 50 cm. length can be examined. 
Fig. 59. 
The coarse-adjustment is by sliding in the tube, the fine by micrometer 
movement of 5 mm. extent. The double mirror is laterally adjustable. 
There are clamps, &c., for fixing the preparations. For greater con- 
venience of observation the instrument can be provided with an erecting 
prism. 
Practical Instructions for Making a Student’s Microscope.* — Mr. 
J. Swift gives a series of working drawings with practical instructions 
which should enable a good amateur brass-worker to construct a useful 
and efficient Microscope. A simple form of small hand-planing machine 
is sufficient for the purpose, but in the absence of such a machine the 
dovetail slides shown in fig. 60, a , c, d, may be filed to the required 
* F. Koristka, Catalogo Illustrato Descrittivo, N. 7, Milan, 1894. 
t English Mechanic, lix. (1894) pp. 548 and 9. 
