410 



INDEX. 



Spirits, acidity, sweetness and strength 

 of, 378. 



Square numbers, on certain properties of, 

 383-388. 



Stars, results of periodical obser^'ations 

 on ; double, angles of position of, 13 ; 

 difBculty of observing ; results of ob- 

 serving 19 in Sir J. Herschel's list, 

 14. 



, catalogues of, 237. 



Stenhouse (J.) on the action of nitric 



acid on various vegetables, 3. 

 Stereoscope, Wheatstoae's modification 



of, 138 ; binocular effects obtained 



with, 139. 



Stevenson (W.), probable connection 

 between solar spots and aurora, 291. 



Stokes (G. G.; on the change of refran- 

 gibility of light, 195, 333. 



, Kumford medal awarded to, 243. 



Strickland (H. E.), obituary notice of, 

 359. 



Sun, periodicity in spots of, 178. 



, spots of, connection with aurorse, 



291. 



Sutherland (P. C), a few remarks on 

 currents in the arctic seas, 305. 



Sykes (Lieut.-Col. W. H.) on depres- 

 sions of the wet-bulb thermometer, 

 &c., 96. 



Sylvester (J. J.), theory of the conjugate 

 relations of two rational integral func- 

 tions, &c., 324. 



Talbot (H. F.), note on instantaneous 



photographic images, 82. 

 Telescope for southern hemisphere, 



348. 



Temperature, distribution of, in the Alps ; 

 depression greatest in going from 

 south to north; dependent on mass of 

 mountains, 6 ; heights con-esponding 

 to degrees of ; of different months, 7 ; 

 extremes of; comparison with that of 

 high latitudes, 8. 



, means of, in Nottinghamshire, 



94 ; times of greatest heat and cold, 

 95. 



, mean of every day in the year from 



1814 to 1851, 281 ; table of, 283. 



, periodic and non-periodic, varia- 

 tions of ; opposite conditions of, in dif- 

 ferent meridians, 284 ; phenomena of, 

 at Toronto, 285. 



Temperature of atmosphere coincident 

 with temperature of dew-point, 310. 



Temperature of fusion, increased with 

 pressure, 346. 



, difference of, between car-bonic acid 



gas and atmospheric ak, 346. 



Thermo-dynamic engines, theory of, 391. 



Thermometer, wet-bulb, depressions of, 

 96 ; results of observations on, at Ah- 

 mednuggur during hot season, 97. 



Thermometers, gr-aduation, comparison 

 and determination of erTors of, 178- 

 188. 



— — , mercurial and air, sensible differ- 

 ence between, 226 ; law of density il- 

 lustrated by obser-vations on, 227. 



Thomson (AY.) on the thermal effects of 

 elastic fluids, 331. 



Tides, phenomena of, in the Enghsh 

 Channel and German Ocean, 68 ; ro- 

 tatory character of, 69 ; shift in meet- 

 ing-hne of streams of ; discrepancies 

 in, 69 ; importance of knowledge of, 70. 



Tide- wave, effect of, on coast of Norway, 

 201 ; shoals in North Sea formed by 

 effect of; in Baltic, 202. 



Tomes (J.) on the structure and develop- 

 ment of bone, 203. 



Tones, and vibrations produced by bodies 

 at different temperatures, 392. 



Toynbee (J.) on the functions of the 

 membrana tympani, 217. 



on the muscles which open the 



Eustachian tube, 286. 



Turner (Rev. C), bequest of his Ne-^ton 

 collection to the Royal Society, 278. 



, obituary notice of, 365. 



Tyndall (J.) on molecular influences ; 

 Sect. I. transmission of heat thr-ough 

 organic stmctm'es, 270. 



on the vibrations and tones pro- 

 duced by the contact of bodies having 

 different temperatures, 392. 



Urine, frequent occurrence of indigo in, 

 327. 



Vapours, satm'ated, general law of densitv 

 in, 97. 



, specific heat of, 300. 



Vertebrae, exogenous processes of ; defi- 

 nition of, 8 ; distinct names for, in 

 different animals, 9 ; compar'ative ana- 

 tomy of, 10, 11. 



Victoria Regia, structure of the stem of, 

 170. 



Ville (G.), experimental researxhes on 

 vegetation, 307. 



Vision, physiology of ; binocular pheno- 

 mena of, 138 ; experiments on, with 

 stereoscope, 139 ; conversions of re- 

 lief in pseudoscope, 140. 



Vogel (E.), letter on the expedition to 

 Central Afiica, 374. 



WaiTcn (Rev. J.), obituary notice of, 258. 

 Waterston (J. J.) on a general law of 

 density in satm-ated vapours, 97. 



