A text-book on chemistry : for the use of schools and colleges . most common element-ary substances, being found abundantly united with va-rious metals, such as iron, copper, lead. In combinationwith lime, baryta, &c, it occurs as sulphuric acid, and is Why can not it be isolated ? How may it be purified ? How may itbe detected ? Why can not nitric acid be detected by precipitation ? Un-der what forms does sulphur naturally occur? FLOWERS OF SULPHUR. 213 also an ingredient of many animal and vegetable prod-ucts. Sulphur is met with under three different forms : rollsulphur, flowers of sulphur,
A text-book on chemistry : for the use of schools and colleges . most common element-ary substances, being found abundantly united with va-rious metals, such as iron, copper, lead. In combinationwith lime, baryta, &c, it occurs as sulphuric acid, and is Why can not it be isolated ? How may it be purified ? How may itbe detected ? Why can not nitric acid be detected by precipitation ? Un-der what forms does sulphur naturally occur? FLOWERS OF SULPHUR. 213 also an ingredient of many animal and vegetable prod-ucts. Sulphur is met with under three different forms : rollsulphur, flowers of sulphur, and lac sulphuris. Roll sul-phur is an impure variety, which receives its form frombeing cast into cylindrical molds ; the flowers of sulphurare formed from the impure brimstone by sublimation;lac sulphuris differs from the foregoing in being of a whitecolor. It is prepared by precipitation from the persulphu-ret of potassium by hydrochloric acid. The preparation of flowers of sulphur is conducted inan apparatus, such as Fig. 215. A is a room, or chamber,. of 2000 feet capacity ; c is a pan containing sulphur, whichis melted by the furnace, o s ; the vapor passes along i db, and, entering the chamber, is there condensed. The re-sulting flowers are removed through the door p. If anexplosion occurs, when the process commences, it liftsthe valve c, and the gases escape through the chimney, M is a shed under which the apparatus is the iron pan becomes exhausted, new quantities ofbrimstone can be introduced through the door n. Sulphur commonly exists as a solid of a yellow col-or, and of a specific gravity of 1*99, having neither tastenor smell. It melts at 226° F. into a pale yellow-coloredliquid ; but what is very curious, if the heat be raised toabout 450° F., it changes to the color of molasses, and be-comes so thick and tenacious that the capsule in whichthe fusion is carried on may be turned upside down with-out the sulphur flowing out. At 600° F. it boi
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