The New International Encyclopædia/Arbor Dianæ

ARBOR DIA'NÆ (Lat., tree of Diana, the alchemic name of silver). An arborescent precipitate of metallic silver from a solution of silver nitrate, produced by the addition of a metallic element such as mercury. The proportions recommended are as follows: Dissolve twenty grains silver nitrate in one fluid ounce of water in a convenient bottle, add one-half dram of pure mercury, suspend a piece of zinc by means of a fine thread secured to the cork, and in a day or two the arborescent appearance will present itself.