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The backward solvent extraction with dithizone(H2dz)–CCl4 solutions was used to examine the chemical species of bismuth(III) in 1 mol dm−3 of a (H,Na)Cl solution. A tracer concentration of bismuth(III) (ca. 10−11 mol dm−3) was found to exist mainly in the form of [BiCl5]2−, [BiCl5(OH)]3−, [BiCl4(OH)]2−, and [BiCl3(OH)3]3− in the (H,Na)Cl solutions. The constants of the successive hydrolysis, β1, β2, and β3, were calculated by using the distribution data. The resulting logβ1, logβ2, and logβ3 values were 10.9, 17.5, and 30.2 respectively. The chemical composition of the extracted species was most probably [Bi(Hdz)3].

Chemical investications were carried out on wool of sheep parasitized by flukes. The comparison of the results of the study on the Australian merino wool with 13 kinds of Japanese wool are summarized as follows; 1) Kempy wool content in the inflicted wool is higher than in the merino.2) Grease content is poorer than in the merino.3) Total nitrogon and diamino acid-nitrogen contents are poorer, but amide-nitrogen and mono amino acid-nitrogen contents are richer than in the merino. Total sulfur content is somewhat poorer and tyrosine content lies between 3.3 and 6.4%. 4) Affinity of acid color on Japanese wool is smaller, and that of basic color varies in some cases. Acid combining capacity relates to the affinity of basic color on Japanese wool. (Received 4. 5. 1956)

Deterioration and yellowing of silk fibroin were hitherto controlled by methylation with diazome thane, but in this paper it is shown that the shrinkages of silk by neutral salts and mineral acid