Examined the learning processes in paramecium. Two tests were carried out. 8 Ss were used in the first test, where each paramecium was drawn into a glass tube and its movements were observed with a key and a kymograph. In the 2nd test, 6 Ss were transferred to an open watch-glass of culture-water. After an interval of 10 to 20 mins, they were replaced in the capillary-tube and observed as in test 1. Results reveal that the paramecium is capable of modifying its usual avoiding reaction, within a few minutes. The effect of this modification remains for some time independently of external changes induced. Suggestions for further research have been offered. (PsycINFO Database Record (c) 2006 APA, all rights reserved)