APPARATUS 
15 
to be only ,one pair, they must be strong enough for the slides but 
not too clumsy for covers. Curved forceps are not necessary; the 
cover-glass forceps, used by bacteriologists in staining on the cover, 
are of no use in botanical work. 
Stender dishes are very generally used in staining on the slide. 
The form shown in Figure 13A, about 60X90 mm., is in quite general 
use. Some prefer the Coplin jar, shown in Figure 135. The latter 
is more troublesome to clean, but requires less of the reagent. Many 
other forms are bn the market. When large numbers of slides of the 
same kind are to be stained at one time, small battery jars, holding 
about a liter, may be used. In this case, it is well to have a rack, 
holding about thirty slides, so that all may be transferred at the 
same time from one reagent to another. With this convenience, it 
is not necessary to handle the slides separately, except at critical 
stages. 
A 
B 
Fig. 13.—Staining-dishes: A, Stender dish; B, Coplin jar 
A very cheap and practical device, which can be used in an 
ordinary Stender dish, is shown in Figure 14. It is simply a coil of 
brass wire, 0.064 inch in diameter (No. 14, Band’s gauge), wound so 
that the coil is about f inch across. Such a coil, carrying 15 slides, 
will go into an ordinary Stender dish, except that the coil projects 
enough to prevent the cover from fitting. Taller glasses, from the 
five and ten cents store, can be used for the absolute alcohol and xylol, 
which must be kept well covered. We have been using a coil made 
from wire 0.051 inch in diameter (No. 16 Band’s gauge), wound so 
that the coil is if inch across. It holds the slides and the ordinary 
Stender dish can be covered. 
