On August 23, 1941, on the way of the pot-colture experiment of rice plants, a severe tyhoon swept over Riri district, Sowth Korea. 1. With variety "Kokuriyomiyako", the following relations were observed. The panicles which were subjected to the storm at the time of full heading were most severely damaged, followed by the less severe damage with the panicles which appeared by 2/3 portion, panicles headed one day before, and that appearing by 1/3 portion in this order. But the panicles of 2 to 3 days after full heading and not-headed were very slightly damaged. 2. Percentage by weight of rice kernels divided into the groups, A, B, & E according to Togari's classification of rice grains damaged by storm was 100, 95.7, 88.7, 71.4 & 61.3, respectively (taking A as 100) 3. The correlation coefficient between the degree of grain damage and weight of the kernels was calculated as r=0.639±0.020. 4. On the quality as white, brown, green and chalky kernels, parallel relation was mostly recognized between the damage grains and the kernels. 5. The facts as No. 2, 3 and 4 described above suggest that the damage decrease after heading time of rice plants may be possible to know by the classification of damage grains caused by wind storm.
