1. Absorption spectra of a number of ethylenediamine cobaltic complex salts have been observed. Generally speaking, their absorption bands, especially the second, are more hypsochromic than those of the corresponding ammine salts. 2. The results have proved that the author’s hypothesis on the absorption spectra holds good for the ethylenediamine complex salts. 3. Examples of the third absorption bands have been found in the diethylenediamine cobaltic complexes of known configurations. 4. A new method of separating [Co en3]3+ and [Co en2Cl2(6)(1)]+ has been devised.
Hydrogen bromide was added to cholesteryl bromide in carbon tetrachloride. In the presence of catechol or ferric chloride a hydrobromide melting at 101.5° was obtained. Addition in ethereal solution gave the same product. Simultaneous action of oxygen yielded another hydrobromide melting at 154° and a substance with the composition of a dibromide of cholesteryl bromide. The direction of addition of hydrogen bromide is assumed to follow the examples of additions to simpler ethenoid compounds. The properties and the transformations of the hydrobromides are described. The both hydrobromides lose hydrogen bromide more or less easily.
(1) The foam formation of mixed aqueous solution containing saponin in a constant amount and ethyl alcohol in varying concentration was studied. Life of the foam produced in aqueous solutions of saponin (concentrations being 0.009085 g./l. and 0.001820 g./l.) is remarkably increased in length by the addition of alcohol within the region of concentration covering over from 0.0026 mol/l. to 0.77 mol/l. Addition of alcohol in concentration exceeding 0.77 mol/l. again renders the foam unstable. (2) Attempts were made to explain the mechanism of foam formation relating to the above phenomena. (3) Foam and hydrosol were compared with respect to their properties as a disperse system, from which some resemblances as well as differences were pointed out between them.