204 
trude into the sandstone and conglo- 
merate near N. Berwick, 101. 
Potassium, phosphorescence of, 59. 
Powell (Rev. Prof.) on the refractive m- 
dices of several substances, 14. 
Provident classes, mortality of the, in this 
country and on the continent, 151. 
Purbecks, on the succession of strata and 
distribution of organic remains in the 
Dorsetshire, 79. 
Raisins, on the preparation of, 151. 
Ramsay (Prof.) on the geological position 
of the black slates of Menai Straits, 
&c., 102. 
Rankin (Rev. T.) on meteorological phz- 
nomena at Huggate, for 1849, 42. 
Rankine (W. J. Macquorn) on the laws 
of the elasticity of solids, 2 
Read (George) on ropy bread, 60. 
Reade (Rev. J. B.) on a new solid eye- 
piece, 15. 
Reflexion, on metallic, 19; on the mode 
of disappearance of Newton’ s rings 
in passing the angle of total internal, 
Ricinus communis, on, 132. 
Rifles, on the application of telescope 
sights to, 188. 
Right ascension, on a sidereal clock for 
showing the arc of, 23. 
Rivers, on the constant increase of eleva- 
tion of beds of, 72; on the erosions 
of the earth’s surface, especially by, 
85. 
River terraces, on, 87. 
Roberts (Richard) on the expansion of 
solids by heat, 16. 
‘‘Roches Moutonnées” in the lake di- 
strict of Westmoreland, on, 76; post- 
script, 112. 
Rocks, on the chemical composition of 
the, of the coal formation, 63; on 
striated and polished, in the lake di- 
strict of Westmoreland, 76; on the 
manner in which trap or igneous, in- 
trude into the sandstone and conglo- 
merate near N. Berwick, 101. 
Rose (Alexander) on the recent discovery 
of plumbago or graphite in the island 
of Mull, Hebrides, 102. 
Russell (R.) on the passage of storms 
across the British Islands, 42. 
Ruthven (M. W.) on improvements in 
propelling and navigating steam ves- 
sels, 186. 
Salt, on the effects of, on vegetation, 114. 
Sanderson (John S.) on the supposed re- 
lation of the spleen to the origin of the 
INDEX II. 
coloured blood-corpuscle in the adult, 
134. 
Sandstone-and conglomerate near N. 
Berwick, on the manner in which trap 
or igneous rocks intrude into the, 
101. 
Sandstone of Dura Den, on the yellow, 
70. 
Scoffern (Dr.) on the sugar produce of 
the south of Spain, chiefly in connexion 
with the employment of acetate of lead 
τὰ sulphurousacid as purifyingagents, 
0. 
Scoresby (W.) on Atlantic waves, their 
magnitude, velocity and phznomena, 
26. 
Scotland, on the geological structure and 
relations of the frontier chain of, 103 ; 
list of organic remains in, 107; on the 
evidence of the existence of primitive 
races in, prior to the Celt, 142. 
Sea-beaches, on terraces and, 87. 
Sea-level, on recent changes of, 71. 
Sectors; on the occasional distinct vision 
of rapidly revolving coloured, 21. 
Sedgwick (Rev. Prof.) on the geological 
structure and relations of the frontier 
chain of Scotland, 103. 
Seller (Dr. William) on a physiological 
mode of resolving the metaphysical 
difficulties as to the origin of the no- 
tion of space, of motion, of the exter- 
nal, of substance, &c., 135. 
Shooting stars in the interplanetary 
spaces, on the distribution of, 24. 
Sicilian and Sardinian languages, on the, 
140. 
Silica and alumina, on the isomorphous 
relations of, 50. 
Silk suspension threads for the declina- 
tion magnetometer, on the construction 
of, 10. 
“Silurian System of Bohemia,” Sir R. 
I. Murchison’s review of the labours 
of M. Barrande in preparing this work, 
97. 
Slate at Collyweston, near Stamford, on 
the Stonesfield, 74. 
Slates of Menai Straits, &c., on the geo- 
logical position of the black, 102. 
Slavonic population, on the original dis- 
tribution of the, 141. 
Smith (John) on the rubble bridge of 
Ashiesteel, 187. 
Smyth (Prof.) on cometary physics, 31 ; 
account of the Edinburgh Observatory, 
ib.; on a new form of equatorial 
mounting now making for the Edin- 
burgh Observatory, 187; on a mode 
of cooling the air of rooms in tropical 
