INDEX 



327 



Reducing, oxidising and, flame, 230 

 Reflection , from spherical mirrors, 

 166168; of light, 163166; 

 regular, 163166 

 Refraction, effects of, 171173; 

 is accompanied by dispersion, 

 176 ; of light, 168176 ; rules 

 of, 170, 171 ; through a lens, 

 175 ; prism, 173175 

 Regular reflection of light , 1 63 1 66 

 Relation .between British and 

 metric units, of area, 27 ; of 

 mass, 45 ; of volume, 30 

 Relative densities, determination 

 of, by a U-tube, 100, 101 ; by 

 relative density bottle, 98, 99 ; 

 Hare's apparatus for determina- 

 tion of, 101 ; hydrostatic method 

 of determining, 97, 98 ; results 

 of accurate determinations of, 

 101, 102 



Relative density, 96, 97 ; of gases, 

 102 ; principle of Archimedes, 

 and, 91105 



Resolution of forces, 66, 67 

 Resultant, calculation of, 65, 66 

 Results of accurate determin- 

 ations of relative densities, 101, 

 102 

 Rest, motion of bodies falling 



from, 62, 63 



Rigidity, solids possess, 7 

 Rocks formed of silica, 314 

 Rotation, earth's, 34, 35 

 Rotation of the earth, period of, 35 

 Rules of refraction, 170, 171 

 Rusting, combustion and, 228 

 230 



SALT, 262 269; composition of, 

 263, 264; gas, 262, 263; pro- 

 perties of, 262264 



Salts, acid and basic, 305-308; 

 acids, bases and, 299310 ; 

 calcium, 300, 301 ; preparation 

 of, 299, 300 



Scale, Centigrade, 141 ; Fahren- 

 heit, 141 



Scales, conversion of, 141, 142 



Separation of solids, 211, 212 



Sidereal day, 35 



Silica, 313 ; amorphous, 313 ; 

 calcium carbonates and, 311 



316 ; chemically prepared, 314 ; 



rocks formed of, 314 

 Smee's cell, 188 

 Sodium, action of, upon water, 



234, 235 ; sulphate, electrolysis 



of, 204, 205 



Soft, hard and, waters, 244 

 Solar, mean, day, 34, 35 

 Solids, 6 10 ; possess elasticity, 



7 9 ; possess rigidity, 7 ; 



possess tenacity, ductility and 



hardness, 9, 10 ; separation of, 



211, 212 

 Solution is a physical change, 



209, 210 



Solution of liquids, 213 

 Solvent power of hot and cold 



water, 212 

 Spherical mirrors, reflection from, 



166168 



Stability, conditions of, 86, 87 

 Stalactites and stalagmites, 312 

 Stalagmites, stalactites and, 312 

 States of matter, physical proper- 

 ties and, 1 20 

 Substances, various, present in 



air, 225, 226 

 Sulphate, copper, electrolysis of, 



203, 204; sodium, electrolysis- 



of, 204, 205 

 Sulphates, 255 

 Sulphides, 255, 256 

 Sulphites, sulphurous acid and,. 



252, 253 



Sulphur, and its compound, 248 

 261 ; crystalline, 250, 251 ; 

 dioxide and sulphuretted 

 hydrogen, formulae for, 272, 

 273 ; dioxide, properties of, 

 252 ; effects of heat upon, 249 ; 

 oxides of, 251, 252 ; physical 

 properties of, 248, 249 ; plastic, 

 249, 250 ; trioxide and sulphuric 

 acid, 253, 254 ; varieties of, 

 249, 251 



Sulphuretted hydrogen, 256258;. 

 formulae for sulphur dioxide 

 and, 272, 273 ; quantitative 

 composition of, 258 



Sulphuric acid, action of, on 

 metals, 254, 255 ; manufacture 

 of, 255; sulphur trioxide and, 



253, 254 



