ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
555 
a rubber stopper perforated for an inlet and outlet tube. The former 
reaches nearly to the bottom, and the latter projects a short distauce 
below the stopper. A piece of wire gauze or a perforated plate is in- 
serted in the long tube just below the level of the outlet tube, to prevent 
escape of the material. As indicated in the illustration, any particular 
bottle can be removed from the series without interfering with the 
general arrangement. 
Apparatus for Drawing off Sterile Fluids.* — Dr. Stanilaus Epstein 
has devised an apparatus (tigs. 147, 148) for drawing off measured quan- 
tities of sterile fluid. The apparatus consists of a vessel R, which 
contains the sterile fluid, a graduated burette E, and a bell-jar F closed 
with a cork stopper H, upon which is placed a thin layer of cotton-wool. 
In the vessel R are two openings, the upper one being plugged with 
cotton-wool, while to the lower one is attached a rubber tube B to con- 
nect with the burette. The burette E is closed below at K, by means of 
the conical end L of the glass rod D. The glass rod consists of two parts, 
Fig. 148. 
the upper part C being really a hollow tube having a perforation at 0 ; 
the lower part D is solid. The upper part of the burette is plugged 
with cotton- wool N ; the lower part fits into the bell-jar at 4*. The 
second figure shows a cap for covering the upper opening 0 of the 
vessel R. 
The apparatus is best sterilised in two parts. The vessel R and the 
tube are one piece ; the rest of the apparatus is another. A pinchcock 
is put on the tube at M. To use the apparatus, the stopcock M is 
opened and the burette filled up to any mark. By raising the tube C, 
the conical end L is also raised and the burette emptied. 
Removal of Air Bubbles and other Gases. t — Mr. E. W. Berger 
states that air-bubbles may be easily removed by immersing the objects 
for a few hours (2-24) in water which has been boiled. 
Cement for Fastening Metal to Glass. J — 200 grm. of finely pow- 
dered litharge of silver and 100 grm. of dry white lead are well mixed 
and worked up to a pasty mass with boiled linseed oil and copal lac. 
* Centralbl. Bakt. u. Par., l te Abt., xxii. (1899) pp. 34-5 (2 figs.), 
f Journ. Applied Microscopy, ii. (1899) p. 388. 
t Zeitschr. f. angew. Mikr., iv. (1899) p. 333. 
