CONTENTS, V 



Page 



NUMBER LI. MARCH. 



Dr. E. Turner on the Volatility of Oxalic Acid 161 



Mr. B. Bevan on the relative Hardness of Road Materials 164 



Mr. T. Batchelor's Observations on a Species of Muscae Voli- 



tantes apparently existing in theAqueous Humour of the Eye 165 

 Mr. C. Rumker on Mr. Witchell's Method of clearing a Lunar 



Distance 1 68 



Mr. W. J. Henwood's Facts bearing on the Theory of the 

 Formation of Springs, and their Intensity at various Periods 



of the Year 170 



Prof. Encke on the Calculation of the Orbits of Double Stars 178 

 Mr. A. H. Haworth's Botanical Description of Hermione 



Cypri > 183 



Mr. J . Ivory on an Omission in Clairaut's Theory of the Equi- 

 librium of a homogeneous Fluid; in some Remarks on the 

 56th Article of the " Bulletin des Sciences Mathematiques" 



for August 1830 185 



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

 Geology which seem to bear most directly on theoretical 



Speculations (continued) 188 



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



of the Bushmen (continued) 197 



Mr. D. Gilbert's Statement respecting the Legacy left by the 

 late Earl of Bridge water, for rewarding the Authors of 

 Works, to be published in pursuance of his Will, and de- 

 monstrative of the Divine Attributes, as manifested in the 



Creation 200 



New Books : Six Maps of the Stars: published under the 

 Superintendence of the Society for the Diffusion of Useful 



Knowledge r . 202 



Proceedings of the Royal Society 206 



Linnaean Society 210 



Geological Society 21 1 



Astronomical Society 220 



Zoological Society 222 



Parhelia, &c. lately seen at Bedford '..'.".' 232 



Aurora Borealis of the 7th of January 233 



A Mode of ascertaining the Value of Manganese Ores 235 



Electro-chemical Decomposition of the Vegeto-alkaline Salts 237 

 Lunar Occultations of Planets and fixed Stars by the Moon, 

 in March 183L Computed for Greenwich, by T. Henderson, 

 Esq. ; and circulated by the Astronomical Society Meteo- 

 rological Observations 238 



NUMBER LIL- APRIL. 



Mr. F. Baily on the Computation of the Moon's Motion in 

 Right Ascension 241 



Errata 



