On the water culture, the silicic acid was effective, when it was given from germinating till the end of July or the beginning of August. But if it was given later, silicic acid was of little use, and the later the silicic acid was manured, the less the value obtained. Especially if the silicic acid was given at the latest stage of the growth, it was hard to expect complete growth. The rice plants were cultured in the solution containing the silicic acid at the beginning and transplanted every 10 days in the solution which had not silicic acid, then I found that the rice plants which were transplanted after the middle of August, grew normally. Those, however, transplanted before that time could only show poor growing - it may be called imperfect growing. Consequently silicic acid gave great effect to the action of ears bearing. Note : - The water culture solution of this experiment was as follows : [table]