560 
SUMMARY OF CURRENT RESEARCHES, ETC. 
of strong nitric acid is added. After, in either case, remaining in 67 
per cent, alcohol for a day, the tissue is kept in 82 per cent, alcohol till 
it can be cut. 
Sections may be made free-hand or the collodion method may be used ; 
details of the method are given. For staining, nothing has been found 
superior to the author’s hsematoxylin (see p. 564) and eosin or picric 
acid. 
(3) Cutting-, including- Imbedding- and Microtomes. 
Reichert’s Microtomes with Oblique Planes.*— In the smaller in- 
strument, represented of half its natural size in fig. 84, the object slide is 
moved forward on the oblique plane either by hand or by means of a 
micrometer screw which is provided with a snap-arrangement. The 
knife-slide and also the object-slide rest on fine points. The object- 
Fig. 84. 
clamp has a ball-and-socket joint to enable the object to be easily 
brought into any desired position. The length of the slide-way for the 
knife = 25 cm. The slide-ways and the body of the microtome are 
made of cast iron, the guiding points of the knife and object-slides of 
steel or ivory. The apparatus is nickeled to protect from rust. 
The second instrument, of larger size, represented in fig. 85, has a 
length of slide-way of 30 cm. The forward movement of the slide is 
effected by a micrometer screw which allows the object-slide to be 
* Reichert’s Catalogue No. 18 (1892). 
