ZOOLOGY AND BOTANY* MICROSCOPY* ETC. 
677 
By means of a thin metal rod, the handle M imparts a to-and-fro 
movement to a shallow rectangular metal tray, which is suspended by 
four wires to a wooden framework. The regular to-and-fro movement 
of the tray is effected by two small metal forks which act as guides. 
In fig. 80 is given a general view of the apparatus. In the tray are 
placed glass capsules to contain the pieces of organs or tissues which are 
to be stained, washed, hardened, or impregnated. In order to set the 
tray in motion, the plate S is levelled horizontally by the screw V, and 
water through a lead pipe is run into the compartment b of the hopper, 
so that it strikes against the wheel R 
and sets it in motion. The rapidity Fig. 81 . 
of the wheel’s motion is regulated by 
different calibre of tube, &c. 
As an example of how the apparatus 
works, it is stated that sublimate solu- 
tions, &c., can be extracted in two days, 
the spirit only requiring to be once 
removed. 
To make gelatin tubes for the 
Esmarch method, the screw Y is made 
to give a greater or less inclination to 
the apparatus, according as there is 
more or less gelatin in the tube (see 
fig. 79). The water stream is then 
run into the a compartment, so that 
it first runs out through the pipe P to 
cool the test-tube T, and then passes 
over the barrier into the b compart- 
ment, and so sets the wheel in motion. 
Injection-syringe for Bacterio- 
logical Purposes.* — This syringe, 
which is the invention of E. Stroschein, 
consists of two glass tubes which are 
somewhat like ordinary test-tubes 
though smaller. The inner, narrower 
tube is prolonged at its front end to a 
conical point on which to fit the canula ; 
at its posterior end is a small hole. 
The outer tube simply fits over the 
inner, and the two are connected with 
a caoutchouc band. 
The syringe is filled by merely 
dipping the canula into the fluid to be 
injected, and then drawing the outer 
tube back as far as the elastic band 
permits, and so by creating a vacuum the fluid is sucked into the 
inner tube. Of course the fluid is injected by merely reversing the 
action. This little instrument, which is very moderate in price, 
* Mittheil. aus Dr. Brehmer’s Heilanstalt, 1889. Cf. Centralbl. f. Bakteriol. u. 
Parasitenk., vii. (1890) pp. 746-7 (3 figs.). 
1890. 3 B 
