ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
449 
tions : — Saturated aqueous solution of picric acid 50 per cent. ; 6 per 
cent, solution of formol in water 50 per cent. 
The sections are floated on the fixative dropped on the slide, and 
after 5—15 seconds are floated back on water. They are then returned 
to a slide, on which some 0*5 per cent, methylen-blue, patent B, has 
been pipetted. The slide is heated until a bubble appears, and is then 
allowed to cool. The excess of stain is washed off and the preparation 
heated with 10 per cent, anilin oil in absolute alcohol until no more stain 
is given off. The section is then mopped up with blotting-paper, and 
cleared with origanum oil, the last traces of which are removed with 
benzin. It is Anally mounted in colophonium prepared by heating 
the resin in a porcelain capsule together with a very little benzin. The 
colophonium is smeared over the surface of the section with a glass rod. 
A cover-glass is imposed and the preparation heated until the cover- 
glass is in position. 
(3) Cutting-, including- Imbedding- and Microtomes. 
Reichert’s Microtome with Conical Bearings. — This (fig. 115) is 
intended for paraffin sections and for small histological objects. It has 
Fig. 115. 
an adjustable knife-carrier, a micrometer-scrtw for raising the object, a 
screw for clamping to table, a screw for holding the object firmly, a simple 
freezing apparatus, and a razor. 
