780 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
MICROSCOPY. 
a. Instruments, Accessories, &c.* 
C3) Illuminating 1 and other Apparatus. 
Practical Drying Oven.j — Feeling the need of a compact drying 
or hardening oven for slides in which a uniform temperature could be 
maintained — one in which the slides would be held in place without 
disturbing the specimen and at the same time be easy of access, 
Mr. W. N. Preston made the oven illustrated in fig. 107. As will be 
seen by the figure, the rack is placed in a 6J inch water-bath, which, 
having a hole bored in the screw cap A, keeps the heat at or below 
boiling point. This oven may be set on a stove or on a tripod over a 
Bunsen burner or other flame. The rack is made with slides or ways for 
the drawers to run on. The drawers, twelve in number, and holding 
Fig. 107. 
three slides each, are made from one piece of metal, the sides and ends 
being 1/8 in. high, and two similar elevations being turned up from 
the centre hole make three divisions in the drawer, each holding a 
slide which may be taken out, examined, and replaced at pleasure. 
The three holes in the drawers, as shown at B, are for the purpose of 
allowing the ready removal of the slides by placing the finger under and 
raising them, and also admit of the hardening of inverted mounts. 
Should spring clips be necessary for holding the cover-glasses in place, 
* This subdivision contains (1) Stands; (2) Eye-pieces and Objectives; (3) Illu- 
minating and other Apparatus ; (4) Photomicrography ; (5) Microscopical Optics 
and Manipulation; (fi) Miscellaneous. 
j Froc. Amer. Mier. Soc., xiv. (1893) pp. 152-3 (1 fig.). 
