1. The sorption amounts and velocities by chabazite of fifteen substances have been measured at 25.0°C. by a statical method. 2. The sorption amounts of the vapours of pentane, benzene, ether, chloroform, carbon tetrachloride, acetone, and ethyl acetate have been found to be negligibly small, while those of methyl alcohol, methyl amine, carbon dioxide and carbon bisulphide have been found to be great. Ethyl alcohol, ethyl amine, propyl amine and butyl amine have been slightly sorbed. 3. No change in appearance of the mineral has been observed by the first sorption of alcohols, amines and carbon dioxide, but in the case of carbon bisulphide the crystal of chabazite have becomes yellow in colour, probably indicating catalytic decomposition of this vapour into free sulphur, hydrogen sulphide and other decomposition products. 4. By the repeated sorptioas of methyl amine, methyl alcohol and ethyl alcohol, the crystals of chabazite have become more or less fragile, and by heating and evacuating these fragile crystals have disintegrated themselves into fine powders. 5. The vapours which have large molecular volumes are generally difficult, if not impossible, to be sorbed by chabazite. The large gaps in sorption amounts between methyl and ethyl compounds in alcohol and amine series may be attributed to the same reason. 6. With regard to the sorption velocities of alcohols, the following formula has been applied which has some theoretical meaning: (Remark: Graphics omitted.) where x is the sorption amount at time t, and a, b, k and h the empirical constants.