A compact unit for comprising rates of absorption or evolution
of gases by small organisms, drying ,respiration. The apparatus
consists of two stoppered boiling tubes connected by three way taps
to either limb of a graduated manometer. One tube holds the organisms
and has a syringe for altering the level of liquid in the manometer
during setting up. The other tube acts as a control thermo-barometer.
C02 given off by the respiring organism is absorbed by potassium
hydroxide in the experimental chamber resulting in a change in the
level of liquid in the manometer tube. Complete with wire baskets
for supporting organisms.