INDEX II. 



281 



Saturn's rings, on an instrument for ex- 

 hibiting the motions of, 02. 



Scotland : — on the chronology of the trap 

 rocks of, 106; on the drift beds and 

 boulders of the north of, 114; on the 

 sculptured stones of, 197; on illegiti- 

 macy in the large towns of, 224. 



Screw propeller, on an instrument for 

 measuring the thrust of the, 237. 



Screw vessels, on the manoeuvring of, 210. 



Seal, on the skull of a, from the Gulf of 

 California, 153. 



Sedgwick (Rev. Prof.) on faults in Cum- 

 berland and Lancashire, 265. 



Segelcke (M. Thomas) on the current 

 method for estimating the cellular mat- 

 ter, or " woody-fibre," in vegetable 

 food-stuffs, 79. 



Senses, on the organs of the, and on the 

 mental perceptive faculties connected 

 with them, 171. 



Shaw (Norton) on the proposed railway 

 communication between the Atlantic 

 and Pacific oceans, via the United 

 States of America, 266. 



Shortrede (Colonel) on calculating lunars, 

 4 ; on an improvement in the propor- 

 tional compass, 63 ; on decimal coin- 

 age, 223. 



Signals, on the retardation of, through 

 long submarine cables, 251. 



Silicates, on soluble, and some of their 

 applications, 78. 



Silk trees of western India, on some pecu- 

 liarities of the, 132. 



Silurian fossils, on the discovery of, in the 

 slates of Uownshire, 260. 



Skull, of a manatee from Old Calabar, 

 150; of a wombat from the bone-caves 

 of Australia, 152. 



Slickensides, on, 123. 



Small-pox and vaccination, statistics of, 

 in the United Kingdom, 223. 



Smith (Dr. E.) on the sequence in the 

 phenomena observed in man under the 

 influence of alcohol, 265. 



Smith (J.) on the relations of a circle 

 inscribed in a square, 10; on the pro- 

 duction of colour and the theory of 

 light, 22. 



Smoke, on coal burning without, 230. 



Snail's heart, on the beat of the, 160. 



Society of Arts' Examinations, on some 

 results of the, 214. 



Solar spectrum, on the law of the wave- 

 lengths corresponding to certain points 

 in the, 20. 



Somateria, on skeletons of, from the plei- 

 stocene brick-clays of Stratheden, 

 120. 



Sorby (II. ('.) on the origin of " cone-in- 

 conc," 124. 



Sound, on the method of production of, 

 by a specks of Notonecta, 173. 



Spectrum, on the mixture of the colours 

 of the, 15. 



Speke (Captain) on the commercial re- 

 sources of Zanzibar on the cast coast of 

 Africa, 266 ; discovery of lake Nyanza 

 in Central Africa, ib. 



Spence (Peter) on Robertson's patent 

 chain propeller, 243. 



Spencer (Thomas) on the supply and 

 purification of water, 83. 



Sphenopteris Hookeri, on, 98. 



Staffordshire, North, on the coal strata of, 

 103. 



Stainton (H. T.) on the distribution of 

 British butterflies, 156. 



Starch-granules, on the structure and 

 mode of formation of, 140. 



Stars, on three variable, as observed con- 

 secutively for six years, 36. 



Statistical Science, 200. 



Statistical tables, on the probability of 

 uniformity in, 3. 



Statistics, vital and economic, of Aber- 

 deen, 226. 



Steam, experimental researches to deter- 

 mine the density of, at various tempe- 

 ratures, 233. 



Steamers, on Indian river, 235. 



Steam-vessels, on the performance of, 237. 



Steel, on the strength of, 242. 



Stereomonoscope, on the, 61. 



Stereoscope, on producing the idea of 

 distance in the, 61. 



Stereoscopic angle, on the, 61. 



Stewart (B.) on radiant heat, 23. 



Stokes (Major J.), notes on the Lower 

 Danube, 197. 



Stones, sculptured, of Scotland, on the, 

 197. 



Stoney (G. Johnstone) on the propagation 

 of waves, 9 ; on the nomenclature of 

 metrical measures of length, 243. 



Strang (John) on church-building in 

 Glasgow, 223. 



Strontia, on crystallized bichromate of, 68. 



Strychnine, on the action of concentrated 

 sulphuric acid on cubebin in relation to 

 the test for, 256. 



Stuart (John) on the sculptured stones of 

 Scotland, 197. 



Sun's surface, on the distribution of heat 

 over the, 50. 



Sutton (Thomas) on a new photographic 

 lens which gives images entirely free 

 from distortion, 63. 



Sykes (Colonel), introductory address to 



