Microscopy. 867 
Dewitz* recommends felt tablets prepared in the following 
Pour the white of eggs, after separation from the yelks, 
w plates, covering the bottom of each with a shin 
in a warm place for a few days, until the white 
ts quite thick. If it is not to be used at once, let it dry 
tely, and then dissolve in cold water whenever needed. 
Take a piece of fine, white wool-felt, of any desired size, and 
ttely saturate it, by pressing and kneading, with the thick- 
{or dissolved) preparation of white. 
$ Take two plates of thick window-glass, a little larger than 
t; warm them over a spirit-lamp, and smear o ide o 
‘with white wax, rubbing the surface well with the finger — 
to make the coat of wax thin and even. When the wax 
® {001 place the piece of albuminized felt between the glass 
Hes, in contact with the waxed sides; and then bind them 
quarter of an hour. After cutting the string the glass 
are easily removed, leaving the felt tablet ready for cutting 
i The and shape required. 
tablets thus prepared should be kept in ninety-five per 
white. It is necessary, however, to select for ` 
potan that do not lose their color in alcohol. 
n fo os used for black, ochre for yellow, cinnabar and 
ae white n 
e eich tablets present a better appearance if they are 
| | Of procedure may be varied so as to 
— Str oe No. 256, p 392, 1887. : 
wax, a thin layer of c ion may be used. 
