Excised palatine mucous membrane of frog suffers from following effects of hydrostatic pressure in Ringer's solution. 1) Pressure up to about 1000 atmospheric pressure inhibits ciliary movement of the mucous membrane. The higher the pressure is further, the earlier the ciliary movement stops. 2) At 1300 (30 minutes)-1500 (10 minutes) atmospheric pressure the secretion of mucous membrane is augmented, and its O(2)-consumption increases at the same time.