yi CONTENTS. 



Page 



Errata in Weisse's Planetary Tables 245 



Mr. C. Gill on the Rectification of Curves 250 



Mr. J. Gordon's Remarks on the Demonstrations of the 

 Theorems of Lagrange and Laplace for the Expansion of 

 Functions, given by Dr. Lardner and M. Lacroix ; with a 



Demonstration of those Theorems 253 



Rev. W. D. Conybeare's Examination of those Phaenomena of 

 Geology, which seem to bear most directly on theoretical 



Speculations 258 



Mr. S. Sharpe on the Reduction to the Meridian 270 



Anniversary Proceedings of the Geological Society 271 



Mr. B. Bevan on the Hardness of Copper Slag as a Material 



for Roads 317 



Lectures on Geology New Scientific Books Lunar Occulta- 

 tions of Planets and fixed Stars by the Moon, in April 1831. 

 Computed for Greenwich, by T. Henderson, Esq. ; and 

 circulated by the Astronomical Society Meteorological 

 Observations . . 318 



NUMBER LIII. MAY. 



On the Impediments to the Study of Natural History; illus- 

 trated by a Reference to certain technical and incidental 

 Obscurities, in the Arrangement of the Diurnal Family of 

 Lepidopterous Insects by various celebrated Naturalists . . . 321 

 On the recent Change of Form of the Summit of Mont Blanc 328 

 Mr. J. Bryce's Notice of the Discovery of the Plesiosaurus in 



Ireland 331 



Mr. J. W. Lubbock on the Tides on the Coast of Great Britain 333 

 Mr. W. Galbraith on the Reduction of the North Polar Di- 

 stances of Stars observed at Greenwich, and corrected by 

 Bradley's Refractions, to Distances according with Ivory's 



Refractions 335 



On the Effect of a Change of Polar Distance on the Reduction 

 to the Meridian of a Zenith Distance observed out of the 



Meridian 338 



Dr. A. Smith's Observations relative to the Origin and History 



of the Bushmen (continued) , . . . 339 



New Books : Phillips's Illustrations of the Geology of 



Yorkshire 342 



Proceedings of the Royal Society 354 



Astronomical Society 361 



Linnaean Society 364 



Zoological Society 366 



- Geological Society 376 



at the Friday- Evening Meetings of the Royal In- 



stitution of Great Britain 380 



Proceedings 



