CONTENTS of N° 15.— New Series. 



XXVI. On the Regular or Platonic Solids. By Davies Gilbert, 

 F.R.S. &c page 161 



XXVII. On the Ellipticity of the Earth as deduced from Experi- 

 ments with the Pendulum. By J. Ivory, M.A. F.R.S 165 



XXVIII. The Climate of Penzance, Cornwall.— Meteorological 

 Results of the Temperature, Wind and Weather deduced from diur- 

 nal Observations made at Penzance for 21 Years : (the Thermome- 

 trical Observations made at 8 a.m. and 2 p.m.) to which are added 

 the Maxima, Minima, and Media of the Register Thermometer for 

 7 Years, with the Inches of Rain fallen during that Period. By Ed- 

 ward Collins Giddy, Curator of the Cabinet of the Royal Geo- 

 logical Society of Cornwall 173 



XXIX. Description of New Succulent Plants. By A. H. Ha- 

 worth, Esq. F.L.S 183 



XXX. On the supposed Subsidence of the German Ocean. By 



A Correspondent ] 8S 



XXXI. On the Measurement by Trigonometry of the Heights of 

 the principal Hills in the Vicinity of Dent, Hawes, and Sedbergh, in 

 Yorkshire. By John Nixon, Esq 189. 



XXXII. On an Apparent Violation of the Law of Continuity. By 



P. M. Roget, M.D. F.R.S 203 



XXXIII. Additional Discussion respecting the Ellipticity of the 

 Earth as determined by Experiments made with the Pendulum. By 



J. Ivory, Esq. M.A. F.R.S 206 



XXXIV. Failure of Lagrange's Method of integrating Linear with 

 Constant Coefficients. By John Herapath, Esq 210 



XXXV. On Systems and Methods in Natural History. By J. E. 

 Bicheno, Esq., F.R.S., Sec. L.S., &c. ( To be continued.) 213 



XXXVI. Notices respecting New Books : — Tredgold on the 

 Stescm-Engine. — Young's Elements of Geometry, with Notes 219-222 



XXXVII. Proceedings of Learned Societies: — Linnaean Society; 

 Geological Society ; Astronomical Society ; Proceedings at the Fri- 

 day Evening Meetings of the Royal Institution of Great Britain 223 — 230 



XXXVIII. Intelligence and Miscellaneous Articles : — Analysis of 

 some Alloys of Bismuth ; Examination of Copper ; On Efflorescence; 

 Native Platina ; Manufacture of Ultramarine ; Heat given out during 

 Combustion ; Inflammable Gas arising after Boring for Salt, Inflam- 

 mable Gas from Salt Mines employed for producing Light ; Natural 

 Gas Lights at Fredonea ; Iodine in Cadmium ; Analysis of the Green 

 Iron Ore and Arseniate of Lead ; Geometrical Problem, by Mr. J. Ro- 

 botham ; Scientific Books ; New Patents ; Meteorological Observa- 

 tions ; Table, &c 230—240 



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

 post paid, to the Care of Mr. R. Taylor, Printer, Red-Lion-Court, Fleet- 

 Street, London. 



