(1) Ostromislenski 氏硫化劑として公知に屬する過酸化ベンゾイル、ニトロベンゼン、メタ•ヂニトロベンゼン及び1:3:5の4種に就き其ゴム溶液の粘度に及ぼす影響を時間的並に量的に精査し此等がゴム溶液の粘度を減少する速度はC型促進劑添加の場合と同じく次式にて表示し得るを認めたり
η_to-η_t=k•logt, k=a+bt
茲にη_toは硫化劑添加前のゴム溶液の粘度 η_tは硫化劑添加t分後の粘度にしてk, a, b等は各硫化劑に特有の恒數なり
(2) 以上の事實より Ostromislenski 氏硫化劑はゴム溶液にデボリメリーゼーションを惹起せしむると同時に或種の化學反應を併起せしむるものなるを推論せり
(3) 過酸化ベンゾイル、ニトロベンゼン、メタ•ヂニトロベンゼン及び1:3:5等とゴムとの化學反應に就き考察を試みたり

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Condensation of 1, 3, 5-trinitrobenzene and methyl ketones (acetone and acetophenone) in the presence of alkali gave some black needle crystals which showed an absorption spectrum similar to that of color reaction produced by 1, 3, 5-trinitrobenzene and active methylene compound in the presence of alkali. This complex decomposes into respective components in an acid solution but in the presence of hydrogen peroxide, 1, 3, 5-trinitro-benzene cannot be obtained and the picryl compound of the active methylene group is formed. Results of paper chromatographic observation showed that the active methylene group in the complex molecule had a tendency to undergo partial substitution with other active methylene compound when they come into contact. From these facts and from the values of elemental analyses and molecular weight determination, it was concluded that the structure of the above complexes should be respresented by formulae (VII) and (VIII).

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A sensitive colorimetric method was devised for determination of cardiac glycosides, oleandrin (I), digoxin (II), digitoxin (III), and ouabain (IV), with 1, 3, 5-trinitrobenzene as a color developing agent in sodium carbonate solution. The addition of sodium dihydrogenphosphate reduced the intensity of blank color.
The test solution was prepared by dissolving I, II, or III in dimethylformamide, and IV in water. To 1.0ml. of the test solution, 0.5ml. of 0.1% solution of trinitrobenzene and 0.5ml. of sodium carbonate solution were successively added, and the mixture was warmed at 42±1°, protected from light. After cooling in an ice-water bath, 0.12% solution of sodium dihydrogenphosphate was added to the mixture to make 5.0ml., and the developed color was measured at the absorption maximum of 460 mμ, with a reagent blank, which followed the Beer's rule in a concentration range of 0 to 100γ/ml. The appropriate concentration of sodium carbonate was 0.2% for I, 0.3% for III, and 0.35% for II and IV. The optimum heating time for the color development was 20 minutes for I, II, and III, and 25 minutes for IV.
Some active methylene compounds interfered with this coloration. Polyphenols, creatinine, indole, and androsterone gave a strong coloration with this reagent. Standard deviation of the method in a concentration of 50γ/ml. of the glycoside is given in Table I, compared with the J. P. method.

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