SECTION I.. Operations Performed on Saline Mineral Substances.

Operations performed on Saline Mineral Substances.

CHAP. I. Of the Vitriolic Acid.

1. PROCESS. To extract Vitriol from the Pyrites 159

2. To extract Sulphur from the Pyrites, and other Sulphureous Minerals 162

3. To extract Alum from aluminous Minerals 165

4. To extract the Vitriolic Acid from Copperas or Green Vitriol 170

5. To decompose Sulphur, and extract its Acid, by burning it 174

6. To concentrate the Vitriolic Acid 176

7. To decompound Vitriolated Tartar by means of the Phlogiston; or to compose Sulphur by combining the Vitriolic Acid with the Phlogiston 179

CHAP. II. Of the Nitrous Acid.

1. PROCESS. To Extract Nitre out of Nitrous Earths and Stones. The Purification of Salt-Petre. Mother of Nitre. Magnesia 181

2. To decompose Nitre by means of the Phlogiston. Nitre fixed by Charcoal. Clyssus of Nitre. Sal Polychrestum 186

3. To decompose Nitre by means of the Vitriolic Acid. The Smoking Spirit of Nitre. Sal de duobus. The Purification of Spirit of Nitre 191

CHAP. III. Of the Marine Acid.

1. PROCESS. To extract Sea-salt from Sea-water, and from Brine-springs. Epsom Salt 195

2. Experiments concerning the Decomposition of Sea-salt by means of the Phlogiston. Kunckel's Phosphorus 197

3. To decompose Sea-salt by means of the Vitriolic Acid. Glauber's Salt. The Purification and Concentration of Spirit of Salt 211

4. To decompose Sea-salt by means of the Nitrous Acid. Aqua regis. Quadrangular Nitre 217

CHAP. IV. Of Borax. 218