(1) 鉄の既知比色定量法を吟味した後, thioglycollic acid methodを改良した本法が, 簡單, 鋭敏, 而も正確であることを確認した。(2) hemin-Fe, non-hemin-Feは直接法, 間接法即ちNa_4P_2O_7法, HCl法, Methanol法を改良した本法で定量可能であり, 而もよく一致することを認めた。(3) ferric, ferrous-Feはthioglycollic acid method及びαα′-Dipyridyl methodを併用した著者の方法によつて充分正確に定量し得ることを認めた。(4) 各種植物の各部位に於ける鉄含量を定量した結果, 種実では檜, 花ではアサガホ, エノコログサ, 根では水稻, 莖ではアカザ, キノコヅチ, 檜等に特異的に多く, 其他は略100∿300γ. per. lg. of dry matter程度含有されており, 而も葉, 莖, 根を比較すれば, より多く葉に含まれてゐることを認めた。(1) I have testified various colorimetric determination of iron and realized thioglycollic acid method was simple, sharp and correct, and in this improvement I could determined the quantity of iron in various vegetable tissue. (2) I have realized that by direct method or indirect method, the determination of hemin-iron and non-hemin-iron is possible and the value of direct method is pararell to the value of indirect method. (3) I have realized that the determination of frric and ferrous iron is possible by my method which is the combination of thioglycollic acid method and αα′-dipyridyl method. (4) I have realized that by the determination of iron in every part of various vegetable, seed, flower, stem and root of the Chamaecy paris obtusa Endl, Ipomoea Nil Roth, Setaria Viridis Beauw Chemodium album L. var. centrorubrum Makino, Achyranthus jap nica Nakai, Oryza sativa L. contains remarkably quantity of iron but other vegetable contains abont 100∿300γ of iron per, lg. of fresh matter and leaf contains much more iron than stem and root
