696 SUMMARY OF CURRENT RESEARCHES RELATING TO 
together, and open when the ball is free. The illustration shows that 
the ball e lies between the metal cups g g , from which proceed two 
Fig. 121. handles i i. The latter are joined together 
by a band h running round the rubber tube 
and playing the part of a hinge. The ends 
1 1 of the holders i i are flattened, bent at 
a right angle and embrace the tube d, which 
is quite closed by their joint action and the 
elasticity of the ball. Hence by pressing 
on the cups the tube d is opened and air 
from the ball passes through the tube. To 
get the inoculation fluid into the pipette the 
ball is held in the right hand, the thumb 
and forefinger nipping the upper end of the 
pipette or the adjacent part of the rubber 
tube. By pressing with the other three 
fingers on the cups air is expelled from 
the ball. The end of the pipette or the 
needle is then immersed in the fluid, the 
thumb of the left hand closing the aperture 
at/. The pressure is th.m removed gradu- 
ally, and the inoculation fluid finds its way 
into the pipette, and when a sufficient 
quantity has collected therein the thumb is 
removed from /. The procedure for inject- 
ing an animal is too simple to require de- 
scription. 
Automatic Burette for Emptying off 
Sterilised Fluids.* — Dr. A. Lode describes 
an apparatus for emptying out definite quan- 
tities of fluids such as nutrient media and preventive serum. The special 
* Centralbl. f. Bakteriol. u. Parasitenk., l te Abt., xviii. (1895) pp. 53-5 (3 figs.). 
