(3) on charcoal. Fuses with much spirting and covers the charcoal with antimonial fumes. When the residual AgS is heated for some time in the oxidizing flame, a bead of pure silver is obtained. (4) in forceps. -- (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. As the preceding. (8) Special reactions. -- * * * * * Mineral. Proustite Formula. [,Ag]^{3}[,,,As]. Behavior (1) in glass-bulb. Fuses and at a low red heat affords a small sublimate of AsS^{3}. (2) in open tube. Gradually heated it gives off AsO^{3} and SO^{2}. Sometimes also antimony fumes. (3) on charcoal. As the preceding, except that a large quantity of AsO^{3} and but little SbO^{3} are given off. (4) in forceps. -- (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. As stephanite, except that much arsenic is given off and but little antimony. (8) Special reactions. -- * * * * * Mineral. Horn silver Formula. AgCl. Behavior (1) in glass-bulb. Fuses, but undergoes no further change. (2) in open tube. -- (3) on charcoal. Fuses readily in the oxidizing flame. In the reducing flame is slowly reduced yielding metallic silver. (4) in forceps. -- (5) in borax. -- (6) in mic. salt. -- (7) with carb. soda. Is rapidly reduced to metallic silver. (8) Special reactions. If cut up into small pieces mixed with oxide of copper and then heated before the oxidizing flame upon charcoal, it colors the flame blue. THE END. * * * * * Transcriber's Notes: Text italicized in the original book is surrounded by '_'. This book had many columnar tables, often split across pages. These have been transformed in data sheets for readability. The notation ^{#} is used for superscripted numbers, indicating the composition of the various chemical compounds. Some of the element symbols were differenced by markings that were not defined in the book, but are supposed to be valence markings. These have been transcribed as follows: