SECT. XLIII.--Observations upon the Lithic Acid, and its Combinations with the Salifiable Bases, 287 TABLE of the Combinations of the Prussic Acid, 288 SECT. XLIV.--Observations upon the Prussic Acid, and its Combinations with the Salifiable Bases, 289 PART III. Description of the Instruments and Operations of Chemistry, 291 INTRODUCTION, 291 CHAP. I.--Of the Instruments necessary for determining the Absolute and Specific Gravities of Solid and Liquid Bodies, 295 CHAP. II.--Of Gazometry, or the Measurement of the Weight and Volume of Aeriform Substances, 304 SECT. I.--Of the Pneumato-chemical Apparatus, ibid. SECT. II.--Of the Gazometer, 308 SECT. III.--Some other methods for Measuring the Volume of Gasses, 319 SECT. IV.--Of the method of Separating the different Gasses from each other, 323 SECT. V.--Of the necessary Corrections of the Volume of Gasses, according to the Pressure of the Atmosphere, 328 SECT. VI.--Of the Correction relative to the Degrees of the Thermometer, 335 SECT. VII.--Example for Calculating the Corrections relative to the Variations of Pressure and Temperature, 337 SECT. VIII.--Method of determining the Weight of the different Gasses, 340 CHAP. III.--Description of the Calorimeter, or Apparatus for measuring Caloric, 343 CHAP. IV.--Of the Mechanical Operations for Division of Bodies, 357 SECT. I.--Of Trituration, Levigation, and Pulverization, ibid. SECT. II.--Of Sifting and Washing Powdered Substances, 361 SECT. III.--Of Filtration, 363 SECT. IV.--Of Decantation, 365 CHAP. V.--Of Chemical means for Separating the Particles of Bodies from each other without Decomposition, and for Uniting them again, 367 SECT. I.--Of the Solution of Salts, 368 SECT. II.--Of Lixiviation, 373 SECT. III.--Of Evaporation, 375 SECT. IV.--Of Cristallization, 379 SECT. V.--Of Simple Distillation, 384 SECT. VI.--Of Sublimation, 388