Abstract
LONDON Society of Public Analysts, December 6. C. H. CBIBB: A specific gravity apparatus. In order to avoid the nessesity for a water-bath with thermostatic control, the bottle, which has a thermometer stopper, is provided with a glass bulb sufficiently heavy to sink in any ordinary fluid and having a diameter about twice that of the neck of the bottle. With this addition, the adjustment of temperature can be made to within a tenth of a degree in the course of a few minutes. G. F. HALL and W. M. KEIGHTLEY: The excretion of aloes. Applying their modification of the Schoutelen reaction, the authors have shown that it is possible in some cases to detect unhydrolysed aloin in the urine for periods up to 60 hours after the aloes have been taken. The unhydrolysed material can be detected at a later period than the hydrolysed drug, since the Schoutelen test is more sensitive than the Borntrager test (for the hydrolysed drug). H. E. Cox: Chemical examination of furs in relation to dermatitis. (4). Chemical reactions of dyeing with p-phenylene diamine and amino phenol. A quantitative study of the oxidation of p-phenylenediamine by hydrogen peroxide in the presence of fur shows that the principal pigment formed is an azine combined with the fur proteins. Some Bandrowski's base is found on the surface of the fibres, and there exists in the solution in the dye-bath much free £>-phenyl-enediamine unoxidised, together with some Bandrowski's base and traces of quinone and ammonia. Similar data are given in respect of p-aminophenol, which forms an oxazine in an analogous manner. The occurrence and properties of intermediate oxidation products in relation to dermatitis are discussed. JOHN GOLDING: Use of the air-damped balance for the determination of total solids in milk. Very rapid determinations of milk solids can be made by evaporating about 1 gm. of the milk in an aluminium cap (which cools very rapidly) and weighing the residue on an air-damped prismatic reflecting balance (Oertling). The influence of the time of drying on the results is shown in a series of tables. G. G. RAO and K. M. PANDALAI: Rapid method of determining minute quantities of nitrites. An iodimetric method has been devised in which the iodine liberated by the interaction of nitrous acid and hydrogen iodide is titrated in the presence of carbon dioxide evolved within the liquid itself. This prevents oxidation of the nitric oxide, also formed in the reaction, and expels it from the system, thereby eliminating the action of the resulting nitrogen peroxide on the iodide.
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Societies and Academies. Nature 133, 114–115 (1934). https://doi.org/10.1038/133114a0
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DOI: https://doi.org/10.1038/133114a0