INDEX 
PAGE 
Abbe condenser, adjusting. 25 
methods of employing. 27 
Aberration, chromatic. 2 
spherical. 2 
Abrasives, abrasive papers. 436 
Absorption of light by crystals. 263 
Acetates, detection of. 421 
Acicular crystals. 251 
Acidification, methods for. 302 
Acids, methods of testing for. 417 
yielding precipitates with barium chloride. 419 
no precipitates with barium chloride. 419 
precipitates with silver nitrate. 417 
no precipitates with silver nitrate. 417 
set free from salte by acetic acid. 420 
sulphuric acid. 420 
Acute bisectrix. 257 
Adsorption, tests involving. 309 
.^olotropic substances. 51 
Agate mortars. ■ . 297 
Air bubbles, optic behavior of. 229 
test for axial light. 26 
Alcohol, use of. 305 
Alums. 389 
Aluminum, common salts. 387 
detection by cesium sulphate. 388 
ammonium fluoride. 391 
Amicrons. 107 
Ammonium, common salts. 332 
detection by chloroplatinic acid. 332 
sodium phosphate. 332 
Amorphous precipitates, treatment of. 312 
Angular aperture of objectives. 4 
Anions, testing for. 415 
Anisotropic bodies. 51 
crystals. 253 
substances, refractive indices of. 234 
Analysis of simple salts. 414 
Analyzer. S3 
467 
