478 
INDEX 
PAGE 
Spectroscopic ocular. 131 
Stage, attachable mechanical. 138 
method of centering.• 55 
Stellite instruments. 170 
Step micrometer. 185 
Strontium, common salts. 339 
detection by bichromates. 347 
oxalic acid. 341 
sodium bicarbonate. 349 
sulphuric acid. 339 
Sublimation. 288 
Subliming cell. 291 
point determinations. 291 
Sulphates, detection of. 427 
Sulphides, detection of. 428 
Sulphites, detection of. 428 
Sulphuric acid, reagent in qualitative analysis. 415 
Supports for objects. i 49 
Symmetrical extinction. 254 
Tables for microscopic work. 156 
Tartrates, detection of. 429 
Testing graduated polarizers and analyzers. 56 
stages. 55 
Tetragonal system, characteristics of. 267 
Textile fibers. 452 
Thermocouple for melting points. 224 
Thickness, measurement of.190, 243 
Thomae cell. 112 
Thiocyanates, detection of. 428 
Thiosulphates, detection of. 428 
Tin, common salts. 393 
detection by cesixun chloride. 393 
Tongs. 15s 
Trichi tes. 251 
Triclinic system, characteristics of. 267 
Trimorphous crystals. 251 
Tungsten lamps for microscopy. 161 
Turmeric-viscose-silk fibers. 448 
Ultracondenser, Jentzsch. 122 
reflecting. 37 
Ultramicrons. 107 
Ultramicroscopes. -^05 
Ultramicroscopid studies, preparing solids for. 113 
Ultraviolet ray illumination. 48 
Uniaxial crystals. 254 
