CONTENTS. V 



Page 



Sir D Brewster's Observations on the preceding Memoir HS 



Dr. W. H. Fitton's Notes on the History of English Geology . 147 

 Account of an Experiment in which Chemical Decomposition 

 has been effected by the induced Magneto-electric Current. 



By P. M. ; preceded by a Letter from M. Faraday, Esq. . . . 161 

 New Books: — Dr. Goring's Microscopic Cabinet* of select 



Animated Objects > 163 



On the Cause of the Production of Heat by Friction and Per- 

 cussion — Preparation of Chlorate of Potash 164- 



Composition of CaiFein 165 



Experiments on Bees' Wax and Vegetable Wax 166 



New Patents — Occultations of Planets and Fixed Stars by the 



Moon, in August 1832 167 



Meteorological Observations 168 



NUMBER HI.— SEPTEMBER. 



Sir D. Brewster on the Undulations excited in the Retina by 

 the Action of Luminous Points and Lines 169 



Mr. R. Potter on an instrument for Photometry by Compari- 

 son, and on some Applications of it to important Optical 

 Phaenomena I74f 



Mr. R. Warrington on the Establishment of some perfect Sy- 

 stem of Chemical Symbols; with Remark^ on Professor 

 Wheweli's Paper on that Subject 181 



Mr. B. Bevan's Tabular Abstract of the Results of Captain 

 Lloyd's Levelling from the Sea near Sheerness to the River 

 Thames at London Bridge 187 



Mr. J. Blackwali's Description of a Species of Arachnida, 

 hitherto uncharacterized, belonging to the Family Araneida; 190 



Mr. B. Boddington's Accurate Statement of Facts relative to a 

 Stroke of Lightning, which happened on the 13th of April 

 1832 191 



jNIr. J. F. Daniell's Further Experiments with a new Register- 

 Pyrometer for Measuring the Expansion of Solids 197 



New Books: — Mr. Edmonds's Life Tables — Mr. E. Hodgkin- 

 son on the Forms of the Catenary in Suspension Bridges, 

 &c. — Theoretical and Experimental Researches to ascertain 

 the Strength and best Form of Iron Beams, by the* same 

 Author — Mr. C. Babbage on the Economy of Machinery 

 and Manufactures — Comparative Account : Population of 

 Great Britain. Ordered by the House of Commons to be 

 printed, 19th October, 1S3J {conihmcd) ; Prof. Leybourn's 

 Mathematical Repository, No. XXIll 204—^20 



Proceedings of the Geological Society 220 



Royal Astronomical Society 234< 



M. Liebig's Preparation of Caustic Potash — Analysis of Cuims 244' 



Transit of Mercury observed at Geneva 246 



On the Evolution of Heat by Friction and I'ercussion — Occul- 

 tations of Planets and Fixed Stars by the Moon 247 



Meteorological Observations. 218 



