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Published online by Cambridge University Press: 15 September 2014
As in the case of the work in the infra-red, the salts experimented on were the nitrate, sulphate, chloride, bromide, fluoride, and iodide, and they were obtained from Kahlbaum. Very little trouble was experienced with the sulphate, nitrate, and chloride. The salts were supplied as CoSo47H2O, Co(NO3)26H2O, CoCl26H2O. The fluoride was a pinkish powder sparingly soluble in water. It dissolved with formation of insoluble oxyfluoride which seemed to increase on standing. By heating the salt and driving off the water of crystallisation, it was found to be Cof22H2O. The iodide was an extremely deliquescent green powder. A slight insoluble chocolate-coloured residue remained in the solution and was filtered off. By heating the salt it was found to have the composition CoI2H2O. The bromide consisted of very deliquescent crimson lumps, and was found to have the composition CoBr26H2O.
page 530 note * “A New Spectrophotometer of the Hüfner Type,” Phil. Mag. (6) xv., p. 282, 1908.
page 533 note * “Untersuchungen über den Einfluss der Temperatur anf die Absorption des Lichtes in isotropen Kö0rpern,” Ann. d. Phys. (4), xxi. p. 535, 1906.
