1. Calcium concentration of recretion sap was nearly constant in certain range of the concentration of KNOP'S solution. When the nutrient solution became diluted, the calcium concentration in the recretion sap suddenly fell. When the nutrient solution became concentrated, the concentration of calcium in the recretion sap also rised. The calcium concentration in the exudation sap was lower than that of the nutrient solution when the nutrient solution was comparatively concentrated and higher when the nutrient solution was comparatively diluted. 2. The amount of calcium exuded per hour was almost constant in certain range of KNOP'S solution and diminished in the low concentration of calcium in the nutrient solution. 3. The volume of exudation sap per hour was almost constant in certain range of KNOP'S solution and diminished when the nutrient solution was more concentrated than natural KNOP'S solution or more diluted than 1/8-KNOP'S solution. 4. When the nutrient solution was simple KH2PO4 solution, recretion ceased when the solution became more concentrated than 0.075%. As the concentration of salt in KNOP'S solution is much higher than this, it seems that recretion has not necessarily to do with the sum of the concentration of salts in the case of KNOP'S solution. 5. The relation between the potassium concentration in the exudation sap and the nutrient solution showed equal tendency with calcium. But it must be noted that the potassium concentration was higher than that of calcium. The amount of potassium exuded per hour was not constant in some range of KNOP'S solution as calcium, but decreased as the concentration of nutrient solution became diluted. In individual plants, the variation of the concentration of calcium and potassium took equal tendency. 6. In soil-cultured plants, the recretion was more vigorous in comparison with that of the water-cultured plants. 7. From the results obtained in Colocasia, the absorption of salts seems not to take place in epithem. 8. The concentration of calcium and potassium was not always low but often high when the volume of exudation sap was great. So great amount of calcium and potassium was excreted in strong recretion. The subject for investigation was suggested by Prof. Dr. H. NAKANO, to whom I wish to tender my best thanks for his kind directions.
1. Remarks on the anatomical characteristics of the three species of Carices described in this paper are shown as below. Carex Rochebruni FRANCH, et SAV.: Upper epidermal cells are large. Protuberances occur in the upper epidermis near the margins. Upper epidermal cells on the nerve are quite similar to those on the mesophyll. Carex stipata MUEHL.: All epidermal cells are large and have conspicuously wavy cell-walls. Protuberances are found in the upper epidermis on the nerve. Spine cells and protuberances are densely distributed in the margins. Carex tenuiflora WAHL.: Protuberances are widely distributed in the upper epidermis on the nerve, in all the cells of the under epidermis and in the margins. Subsidiary cells of the stomata are narrow. 2. Nineteen species hitherto described in five papers published presiously to this, and eight species belonging to Canescentes and Macroce- phalae formerly described, belong to the Subgenus Vignea. Those have not the common critical characters in the leaf-structures to authorize their being grouped as a subgenus, and this fact seems to the writer to suggest that the subgenera of the Carices formerly established should be more fully examined.
1. ひろはのみゝもちしだハ外觀上多少ノ變異ヲ示スモノナルガ内部構造上ニ於テモ變異性ヲ示ス (みゝもちしだモ然ラン)。例ヘバ a) 髓走條ハソノ下端ガ髓中ニ獨立ニ起ルコト, 莖中心柱ノ内面ヨリ分離シテ生ズルコトアリ, 又上端ハ葉隙閉鎖ニ携ハルコト, ソノ儘髓中ニ終ルコトアリ。 b) 葉柄基部ニ於ケル維管束ノ排列ハ可成リ異型ヲ示シ, 時ニ著シキ不規則ヲ示ス。 2. ひろはのみゝもちしだニ於テ, 從來本種或ハみゝもちしだニ於テ知ラレザリシ事實ヲ認メタルコト次ノ如シ。 a) 根莖面及葉柄基部ニ於ケル鱗毛ニ著シキ差異ノアル三型ヲ認ム。 b) 葉柄基部ニ各一個ノ不定芽ヲ認ム。 3. みゝもちしだ屬ノ中心柱系ニツキ次ノ見解ヲ得タリ。 a) 莖中心柱系ハへご型ニ類スレドモ髓走條ノ行動ニヨリ之ト區別シテ “みゝもちしだ型” ヲ設ケテ之ニ編入スベシ。 b) 葉柄中心柱系ハサッコロマ型ニ類スレドモ, 左右ノ列ガ正中線ニテ癒合シ且ツ基部ノ複雜ナル構造ニヨリ之ト區別シテ “みゝもちしだ型” ヲ設ケテ之ニ編入スベシ。