CONTENTS OF N^mir-New Series. 



VII. On some Problems in Analytical Geometry. By J. W. Lub- 

 bock, Esq. V.P. & Treas. R.S page 81 



VIII. Particulars of the Measurement, by various Methods, of the 

 instrumental Error of the Horizon-Sector described in Phil. Mag. 

 vol. lix. By John Nixon, Esq. ( To be continued) 88 



IX. Notes on some recent Improvements of the Steam-Engines in 

 Cornwall. By W. Jory Henwood, F.G.S. Member of the Royal 

 Geological Society of Cornwall 97 



X. On Chemical Symbols and Notation ; in Reply to Professor 

 Whewell. By Mr. John Pride aux, Member of the Plymouth 

 Institution 104 



XI. On Poonahlite, a new Species of Mineral ; on the Identity of 

 Zeagonite and Phillipsite, &c.; and other Mineralogical Notices. By 



H. J. Brooke, Esq. F.R.S. L.S. & G.S 109 



XII. On the Theories of Achromatization, &c. in Reply to Dr. •> 

 Goring. By the Rev. H. Coddington 112 



XIII. On the Thermo-Magnetism of Homogeneous Bodies; with 

 illustrative Experiments. By Mr. Wm. Sturgeon, Lecturer on Ex- 

 perimental Philosophy at the Hon. East India Company's Military 

 Academy, Adiscombe 1 16 



XIV. Of the Conditions of Life. By the Rev. Patrick Keith, 

 F.L.S 124 



XV. On the Statement in the Nautical Almanac for ) 833, of the 

 Time of Beginning of the Solar Eclipse of the 16th of July in that 

 Year ; together with the correct Times of that Eclipse, computed 



for Greenwich. By George Innes, Esq 135 



XVI. Errata in Schumacher's Ephemeris of the Distances of the 

 four Planets Venus, Mars, Jupiter, and Saturn, from the Moon's 

 Centre, &c. for 1833, published by the Admiralty. By A Corre- 

 spondent 136 



XVII. On the Theory of Differences. By S, Sharps, Esq. F.G.S. 137 



XVIII. New Optical Experiments by Professor Airy l^l 



XIX. Proceedings of Learned Societies: — ^-Geological Society; 

 Zoological Society 14-3-150 



XX. Intelligence and Miscellaneous Articles:— General Scientific 

 Meeting at York ; On the Rapid Flight of Insects ; Process for pre- 

 paring Hydrocyanic Acid ; Vanadium, a New Metal ; Magnesium ; 

 On Oxalic Acid, by M. Gay-Lussac ; On Gallic and Pyrogaliic Acid, 

 by M. Henri Braconnot; Analysis of Tennantite, by J. Hemming, 

 Esq. ; New Patents ; Occultations of Planets and Fixed Stars by 

 the Moon in August 1831 ; Meteorological Observations for June 

 1831 ; Table, &c 150-160 



It is requested that all Communications for this Work may be addressed, 

 post paid, to the Care of Mr. R. Taylor, Printing Office, Red Lion Court, 

 Fleet Street, London; where complete Sets of the Old Series of the Phi- 

 losophical Magazine may be had at half of the original price. 



