BARKER, ON A NEW MICROSCOPIC GROWING-STAGE. 13 
thick, or less if it can be procured ; this bottle is fastened on 
the plate A with cement or marine glue; K is an oblong 
piece of glass a little longer than an inch, and about three 
quarters of an inch wide, and of the thickness of ordinary 
slides; this is cemented on. the front of the bottle, and 
through it and the bottle is drilled a small hole, and another 
hole, 'I’, is also drilled a little above the latter into the face of the 
bottle ; Dand E are two blocks of glass of the same thickness 
as the bottle, and which are also cemented to A; F and G 
are the ordinary ledges for supporting the slide which is re- 
presented with covering glass in dotted lines as resting on 
blocks D and E, and close up to K; P'S is a thin piece of 
Gz 
Z 
Oy 
tale fastened with cement at P, or even loose, and covering 
the hole X, and continuing on over the slide so as to rest on 
a small portion of the cover. By raising up the end, S, the 
slide can easily be placed in situ, and then allowing the talc 
to fall gently on the covering glass, it will convey the water 
from the hole in the bottle to the object under the cover, the 
upper hole supplying the air to the bottle, which can be filled 
when exhausted by putting the finger on the apertures, taking 
out the cork, and pouring in fresh water. The stage can be 
put on the stage of the microscope with the slide on it, or the 
slide can be slipped out on raising the talc with a needle. 
The growing stage is to be kept on a small wooden stand like 
a reading stand at about an angle of 50°. 
