Dendrologist; forestry expert. Doctor of Agriculture. Born in Tokyo. Graduated from Tokyo University (1919). Was assistant professor of Agricultural Department of Tokyo University and director of Java Timber-Planting Experiment Station and presently serves as professor of Kyoto University. Went to Europe and America for study of wood decay. Noted for his researches on forestation of cinchona. Works include "Manual of Planting of Cinchona," "Diseases of Cinchona" and "Science of Forest Conservation."