The results obtained in these studies are summarized as follows: 1. The S. T. Y. Wearing Tester of the authors has proven to be a reasonable tester for studies of the wear of shares of the ordinary Japanese plows. 2. From the viewpoint of wear of shares, the soil is advisably classified into three types; sand-, loam- and clay-types. 3. Studies on the wear of shares should be based on the comparison of the results obtained with the soil of the same type. 4. There exists a critical point of the ratio of contained water in the soil that effects a sudden change in the wear of shares of the ordinary Japanese plows. The critical points of the soil of loam-type and of sand-type are 20 per cent and 14 per cent respectively.
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