130 
BULLETIN OF THE BUREAU OF FISHERIES 
level of the fluid in the jar fell low enough to expose the tube. The distributing 
chamber ( D ) was on a lower level and the fluid was admitted to it at a nearly constant 
rate through the tube ( G) which was fitted with a stopcock for regulating the rate of 
flow. The overflow space ( E) at the proximal end of the distributing chamber was 
sufficiently large to prevent the level of the fluid from rising any higher. Variation 
of the level of fluid in this chamber might therefore be downward, due to stoppage 
of tube C, but not upward. Attached by adjustable clamps on vertical bars to the 
wall of chamber D were four dripping chambers (F), only one of which is shown in the 
diagram. 
In Figure 2 the dripping chamber is shown in detail. The inside dimensions 
were: Height, 4.5 centimeters; width, 2.5 centimeters; and thickness, 1.5 centimeters. 
In the top of the front wall a V-shaped opening (O) allowed the fluid to spill over and 
run down, where it dripped from the extending tip ( D ). The back wall ( B ) was 
extended upward to allow attachment to the fixed upright (E). Fluid from the dis- 
tributing chamber (F) passed through the glass tube {A) into the dripper, from which 
it overflowed through C and dripped into the mixing chamber (fig. I, G). 
In Figure 3 is a detailed diagram of the mixing chamber. This was 15 centi- 
meters long, 5 centimeters wide, and 6 centimeters deep, and consisted of a small 
