Gold chloride dissolved in distilled water is employed for gilding glass by the chemical process. The chloride is prepared by dissolving pure gold in nitro-muriatic acid, evaporating the liquid nearly to dryness, dissolving the gold salt in distilled water, then neutralising the remaining excess acid by the addition of soda. The solution should contain 100 gr. of gold chloride in 1 pt. of water, and must be filtered through blotting paper before ttse. Four-fifths of this gold solution must then be mixed with one-tilth of a solution made by dissolving 600 gr. of pure caustic soda in 1 pt. of distilled water, and filtering it through blotting paper. This mixture is poured on the surface of the glass to be gilded, and the gold reduced therefrom by on • of the following re-agents.

(1.) Pass a current of ordinary illuminating gas through 1 pt. of absolute alcohol for one hour, then add an equal quantity of pure glycerine diluted with its own volume of distilled water. From 10 to 15 drops of this mixture will be required to each In dr. of the gilding mixture. Add there-agent a moment or two before using, and pour this on the glass surface to be gilded. In a short time the mixture will turn green, and its gold will be deposited in a bright condition on the glass.

(2.) Chemically pure glycerine, mixed with the caustic soda solution previously described (equal quantities of each) may be employed instead of No. 1.

(3.) Dissolve 300 gr. of glucose in 7 dr. of distilled water, and apply heat until one-third of the water has evaporated; then mix the remainder with an equal bulk of 90 per cent, alcohol. Twenty drops of this re-agent will give the gilding a reddish tinge.

(4.) Dissolve 185 gr. of white sugar in 25 dr. of distilled water, add 1/2 dr. of pure nitric acid, and dilute the whole with an equal qitantity of 90 per cent, alcohol; then boil the whole for a quarter of an hour. Two drachms of this mixture to each 10 dr. of the gilding mixture will be required.

(5.) Employ 2.V dr. of amyl-alcohol instead of the above. This gives a "special brilliancy to the gilding.

(6.) An equal quantity of cane sugar brandy will produce a similar result. The glass to be gilded must be quite clean and free from spots. The solutions must also be freshly prepared, and filtered free from dust.