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Аннотация: The writer who carried out some experiments using water cultured plants in winter observed that, when water temperature was higher, transpiration rates of rooted cuttins of Sugi (Cryptomeria japonica D. Don) were influenced not so much by wind and the rates of seedlings of Sirakasi (Quercus myrsinaefolia Blume) were decreased by wind; while transpiration rate of Sugi was increased by wind and the rate of Sirakasi was not much affected when water temperature was lower. He presumed that the effect of wind on leaf temperature and evaporation, and the influence of temperature of evaporating surface on evaporation are combined together and the combination is observed as the results. To make clear these presumption, some further studies were carried out.