Simple Respirometer

For comparing rates of absorption or evolution of gases by small 

organisms, during 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 thermobarometer. Co2 given off the respiring organisms is 

absorbed by potassium hydroxide in the experimental chamber resulting 

in a change in the level of liquid in the manometer tube. Complete with 

full instructions and wire baskets for supporting organisms.