CONTENTS of N° 17.— New Series. 



LI. On the Ellipticity of the Earth, as deduced from Experiments 

 with the Pendulum ; and on the Formulae employed for obtaining it. 



By William Galbraith, Esq. A.M page 321 



LII. Account of a Paper by Prof. Gauss, intitled" Disquisitiones 

 generates circa Supeijicies Curvas:" communicated to the Royal So- 

 ciety of Gottingen on the Sth of October 1827 331 



LIN. On Savart's Experiments on the Motions of mediately agi- 

 tated Membranes. By Dr. Wm. Weber, Academical Teacher at 



Halle. ( With a Plate.) 336 



Supplement : — On the Employment of a resounding Membrane 

 for the Observation of the Interference of the Undulations of 



Sound 342 



L1V. On the Figure of the Earth, as deduced from Measurements 

 of different Portions of the Meridian. By J. Ivory, Esq. M.A. F.R.S. 343 



LV. Mineralogical and Chemical Examination of the Diopside of 

 Fassa in the Tyrol. By Dr. H. Wackenroder, Professor of Che- 

 mistry at Gottingen 349 



L VI. Description of a Shell, exploding by Percussion when trod 

 upon. By Lieut.-Col. Miller, F.R.S.. 358 



LVII. Account of the Iron-Mine at Haytor, in Devonshire. By 

 J. T. Kingston, Esq 359 



LVIII. Account of a new Method of mounting Thermometers. 

 By Mr. W. Mageough 365 



LIX. Notices respecting New Books: — Horsfield's Descriptive 

 Catalogue of Lepidopterous Insects in the Museum of the East 

 India Company ; Haworth's Lepidoptera Britannica 368 — 370 



LX. Proceedings of Learned Societies : — Royal Society ; Linnsean 

 Society ; Astronomical Society ; Proceedings at the Friday- Evening 



Meetings of the Royal Institution of Great Britain 370 — 391 



Obituary : — Sir J. E. Smith 39J 



LXI. Intelligence and Miscellaneous Articles : — New Minerals; 

 Meteorological Observations ; Tables, &c 397—400 



.%• 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. 



