593 



INDEX. 



Rigidity of earth and latitude 



variations, 525-6 

 tests of by direction of ap- 

 parent gravity, 256-259 

 Robinson, Sir J., 132 

 Rock, buoyancy of in molten 



rock, 303-305 

 Ross, Capt. , 150 

 Rumford, 122, 421, 422, 457 



Sabine, SirE., 141,149-155,516 



Schiaparelli, 191-195 



Schuster, 509, 516 



Schwarez, 56, 57 



Science and practice in engineer- 

 ing, 207-216 



Scrope, 252 



Scudamore, 206 



Siemens, 206, 259, 448-453 



Smith, Archibald, 151, 152 



Smyth, Piazzi, 1 68, 169, 229 



Society of Telegraph Engineers, 

 206-237 



Sodium vapour and the spec- 

 trum, 170, 172 



Solar system, work of, 475-479 



Soleil, 172 



Spectroscope, 168 



and velocity of stars, 181, 

 182, 189 



Spectrum analysis, 90, 168-180 

 and sun, 174-180, 188 



Spontaneous generation, 197- 

 199 



Sprengel, 551 



Spring tides later than full 

 moon, 24 



Stability of planatory motions, 1 1 

 water in a hollow 

 vessel, 592 



Stevinus, 457 



Stirling's air engine, 424 



Stokes, 49, 138, 164, 169, 170, 

 174, 177, 183,529 



Stoney, 166 



Striking distance, electric, 453 

 Sturgeon, 561 

 Sun, composition of, 49 

 eclipse of, 183, 184 

 heat of, 43-53, 82, 83, 96- 

 98, 109, 127-131, 185, 

 1 86, 298 



radiant heat of, 476-477 

 source of mechanical effect, 



432, 435, 440 

 Sunspots and magnetic storms, 



508-23 

 Sylvester, 138 



Tait, 39, 129, 189, 195 

 Telegraph, Atlantic, 161 

 Teneriffe, magnetic observations 



on, 229, 230 



Terrestrial electricity and mag- 

 netism, 216-226 

 Theological students and physics, 



491-492 



Theory and practice in engineer- 

 ing, 207 



Thermo-electric currents, 424 

 Thomson, Prof. James, 289, 



307, 466 



Dr. Thomas, 485, 497 

 Thurston, 462 

 Tidal retardation of earth, 65- 



72, 90-96 

 friction, 270-272 

 spheroid, 21-24 

 Tide mills, 437-440 

 Tides, 15, 17, 136, 137 



and earth's rigidity, 253, 



259-262 



energy of, 436-440 

 equilibrium, 18 

 lunar, 17-20 

 tone, definition of, 395 

 Toricelli, 16 

 Trees in arctic regions, 274- 



280 

 Tyndall, I, 2 



