Vol.62. Philosophical Magazine. Oct. 1823. 



Contents of Number 306. 



XLIX. Complete Description of Erlan, a Mineral long misunder- 

 stood, and newly determined. By Augustus Breithaui'T, and 

 C. G. Gmelin Page 241 



L. Derivative Analysis. By Mr. Peter Nicholson 244 



LI, Discoveiy of the secret Destroyers of the Trees in St. James's 

 Park 252 



LII. Remarks on the Identity of certain General Laws which 

 have been lately observed to regulate the Natural Distribution of In- 

 sects and Fungi. By VV. S. MacLeay, Esq. M.A. F.L.S 255 



LIII. Experiments on the Development of Electricity by Pres- 

 sure ; — Laws of this Development. By M. BEcauEREL, Ancien Chef 

 de Bataillon du Genie 263 



LIV. A few Observations on the Natural Distribution of Animated 

 Nature. By A Fellow of the Linnean Society 274 



LV. True apparent Right Ascension of Dr. Maskelyne's ■ 

 36 Stars for every Day in the Year 1823 276 



LVI. List of Occultations for the Year 1824, computed for the 

 Meridian and Parallel of Greenwich. By M. Inghirami of Flo- 

 rence 273 



LVII. An easy Method of reducing Sidereal into Mean Time. 

 By Dr. T. L. Tiarks 280 



M Doebereiner's New Experiments 282 



LV^III. Note on the Property which some Metals possess of faci- 

 litating the Combination of Elastic Fluids, By MM. DuLONG and 

 TniiXARD 282 



LIX. On Doebereineh's new Experiment. By William Hera- 

 p ath, Esq 286 



LX. On some newly discovered remarkable Properties of the Prot- 

 oxide, Oxidized Sulphuret, and Metallic Powder of Platinum. By 

 Professor Dcebereiner 289 



LXI. On the Paraila.c of k Lyrae, By John Pond, Esq. Astro- 

 nomer Royal, F.U.S 292 



LXII. On a new Steani-Engine Governor- By Mr. J. Preuss, 

 of Hanover, Engineer, late Inspector-general of French Imperial 

 Forests, Fellow of several Learned Societies 297 



LXIII. Notices respecting New Books : A History and Descrip- 

 tion of the French Museum of Natural History : Analysis of Perio- 

 dical Works on Botany 30C-304 



LXIV. Proceedings of Learned Societies : — Horticultural Society ; 

 Meteorological Society ; jNiedico-Botanical Society ; Royal Academy 

 of Sciences of Paris 301-3;)7 



LXV. Intelh'genceand Miscellaneous Articles:— History of the Re- 

 discovery of Encke's Comet ; New Elements of Encke's Comet ; 

 Answer to Mr. J. Harnett's Question; Solution of Mr. Hamett's 

 Question; Longitude and Latitude of Paramatta; Observatory of 

 Dorpat in Livonia ; Measurement of a Degree in Livonia ; The 

 Greenwich Mural Circle; Mr. Groombridge's Transit Circle ; Re- 

 turn of the Northern Expedition under Capt. Parry ; On Felspar, 

 Albite, Labradore Spar, and Anorthite, by Gustavus Rose of Berlin ; 

 Meteors and Earthquakes; Thunder-storm at Rotterdam; British 

 Tenthredos ; Cutting of Steel by soft Iron; Purple Tint of Plate 

 Glass affected by Liyht ; Change of Fat in Perkins's Engine by Water, 

 Heat, and Pressure ; List of New Patents; Meteorological Table 307-320 

 *#* Communications for this Work, received by the Editors, 

 38, Shoe-Lane, will meet with every attention. 



RICIIAKD TAYLOR, jeUlNTEK, t>lIO£-LANE, LONDON. 



