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For it, Mr. Gowin departed from his usual silver gelatin to make a rough-surfaced gum bichromate print, creating a field of mottled blues and starlike white dots on which swirling outlines suggest battling constellations.

A salt containing two parts of chromic acid to one of the other ingredients; as, potassfum bichromate; Ð called also dichromate.

In extensive outbreaks I have had the best results with the administration thrice daily of carbolic acid, nitro-muriatic acid, or bichromate of potassium, and hypodermically of iodide of potassium and sulphate of quinia.

From this we learn that before the potassium bichromate enters into action in the battery, it is resolved into chromic acid.

Other experimenters played variations on Mr. Ponton’s bichromate scale, and amongst the performers were M. E. Becquerel, of France, and our own distinguished countryman, Mr. Robert Hunt.