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October 29, 1887

LETTER FROM LONDON.

JAMA. 1887;IX(18):573-574. doi:10.1001/jama.1887.02400170029011

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Abstract

(FROM OUR OWN CORRESPONDENT.)  Diphenylamine a Test for Watered Milk—The Red Cross Conference—Hereditary Ichthyosis—The Cause of Morning Sickness in Pregnancy—Amylene Hydrate, the new Hypnotic—Iodide of Potassium Treatment of Consumption—Dr. Ferrier.A new and curious test has been discovered by which the smallest addition of water to milk can be detected. It is based upon the fact that all well and river waters contain an appreciable amount of nitrates. They are either nitrates of soda, of potash, of ammonia or of lime, according to the source from which the water is drawn, and when the liquid is evaporated carefully to dryness, the presence of these nitrates can easily be detected in the residue. But there is a means of detecting them without the trouble of evaporating the liquid down to dryness. It has lately been found that drinking-water containing nitrates yields a blue color when a little sulphate of diphenylamine is

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