1. To classify barley by its quality, extraction ratio was tested. In this test the correlations chiefly between ratio and volume weights were considered. 2. Regarding the extraction ratio, its significant differences were observed in the differences among inspection grades, but these differences were due to differences of volume weights, by grade-comparing tests. By block-comparing tests, significant differences of extraction ratio were noticed in the differences among blocks, but those differences were not due to differences of volume weights. In barley, there exist no different means and equal regresion. 3. In the next test to be done, increasing replication of tests in each lots and claasification by form of grain must be considered.
