Relating to previous Report (1), the following experiments were conducted to verify educational effects on tying strings. During January 11 to March 17, 1990, first grade pupils of both sexes in a public elementary school were tested. First, E group (31 subjects) was given initial guidance to tie "Mamusubi" (square knot) and practised it regularly once a week for ten weeks while C group (30 subjects) was asked to do the same tying without guidance and only in the first and tenth weeks. The results of each group were compared. After seven months, follow-up studies of these experiments were conducted. Educational effects of regularly extended practice were evidently proved.
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