INDEX. 519 



Page. 

 Ocean-echoes, probably curved sound-beams reflected from the ocean 



surface 505, 510 



Ocean-echo observed at Block Island 435, 454, 502 



Oil, stratum of, on connecting mercury, found to increase the electric 



shock 187 



Old Anthony Station, observations at, on whistling-buoys 487, 488 



Olmstead, Prof. D., remarks on paper by 290 



Organization of Smithsonian Institution, Programme of 263 



Oscillation of electrical discharge 201 



Owen's investigations on disintegration of building stones 346 



Page, Dr. Charles G., experiment by, on stratum of oil over con- 

 necting mercury 187 



Page, Dr. Charles G., on influence of spiral conductor 108 



Patterson, Dr., reference by, to generation of electricity from steam 189 



Permeability of transparent solids and liquids to phosphorescence. 210, 211 



Philosophical Magazine and Annals, quoted 74 



Philosophical Society of Washington, Bulletin of, quoted 416 



Picking, Commander H. F., co-operation of, in observations on 



sound 487 



Phosphorogenic emanations as derived from electrical spark 205 



Phosphorescence effected by polarized electrical light 207 



Phosphc)rescence, experiments on 191, 204 



Phosphorescence subject to refraction and dispersion 207 



Phosphorescence unequally permeable through difl"erent transparent 



bodies 210, 211 



Plateau, Prof., explanation by, of accidental colors 235 



Plates, effect of, interposed between electrical induction rings 123 



Poe, Gen'l O. M., co-operation of, in observations on sound 392 



Poisson, explanation by, of liquid cohesion and capillarity 218 



Polarization of light, magnetic ; 343 



Portland, ilaine, phenomena of sound observed at 389 



Powell, Commodore L. M., co-operation of, in experiments on 



sound 378, 379, 421 



Prevost, observations of, on color-blindness 237 



Programme of Organization of the Smithsonian Institution 263 



Projectiles (velocity of), a method of determining 212 



Putnam, steamer, used in observations on sound 433, 437, 458, 465 



"Quantity" and "Intensity" currents from same induction 118 



"Quantity" and "Intensity" of induced currents compared 113, 115 



"Quantity" battery productive of stronger terminal induction 153 



''Quantity" current induced by one of "intensity" 118, 157 



"Quantity" currents of induction from ribbon coils 151 



Badiation from burning coal increased by mingling with it incom- 

 bustible substances 289, 355, 357 



