520 INDEX. 



Page. 



Kadiation of heat, experiments on 289, 355 



Kadiation (relative) of solar spots, observations on 224 



Karefaction of air, refrigeration by 1 



Keciprocating motion produced by magnetic attraction and repul- 

 sion 54 



Keflectors for projecting sound, trifling effect of 380, 381, 405, 409 



Kefraction of sound the principle cause of its anomalies 445, 446, 449, 507 



Kefrigeration by rarefaction of air 1 



Kennie's apparatus for testing strength of building stones 347, 348 



Reversal of magnetic polarity due to oscillatory discharge 202 



Eeynolds, Prof. Osborne, observations by, on sound noticed 446, 484 



Eibbon, copper, in a flat spiral effective in increasing electrical 



spark 87, 94, 97 



Eichardson, Dr., observations by, on effect of aurora borealis on 



magnetic needle 59 



Eitchie, Mr., observation by, on law of galvanometer action 41 



Eobison, theory by, of electrical action 301 



Eocker fog-whistle 383 



Eoper hot-air engine, experiments with, for fog-trumpets 385 



Eumford (Count) observations by, on increasing heat of fuel by in- 

 combustible substances . 289,355 



Sabine, Capt., magnetic needle from, used for observations on the 



aurora 60 



Sandy Hook, observations near, on sound 391, 437 



Savary's observations on reversed polarity of magnetized needles — 144, 200 

 Saxton, Joseph, observations by, on different armature coils of 



magneto-electrical machines 117 



Schseffer, Prof. George C, co-operation of, in experiments on alleged 



spontaneous rectification of alcohol 362 



Schweigger's galvanic "Multiplier," adaptation of 4, 37 



Screening effect of interposed plate, experiments on 163, 165 



Secchi, Prof. Angelo, remarks on aurora borealis by 287 



Seebeck, observations by, on color-blindness 237 



Self-induction on a long wire 79, 87, 141 



Selfridge, Captain, witness of abnormal phenomena of sound 415 



Shepard, C. U., experiment by, with large electro-magnet made for 



Yale College 50 



Shock, direct and lateral method of receiving 88 



Signals and beacons to aid navigation, number of, in the United 



States 366 



Siren and DaboU trumpet compared 395, 406 



Siren trumpet as a fog-signal 393, 412, 424 



Smithson, James, bequest by, to found a scientific institution com- 

 mented on 264 



Smithsonian Institution, practical operations of 284 



Smithsonian Institution, Programme of Organization of 263 



Soap-bubble, contractile force of 219 



