CONTENTS of N° 16.— New Series. 



XXXIX. A Letter to the Editors relating to the Ellipticity of 

 the Earth as deduced from Experiments with the Pendulum. By 

 J. Ivory, M.A. F.R.S page 241 



XL. Remarks on the Geology of the North Side of the Vale of 

 Pickering. By John Phillips, F.G.S., Keeper of the Museum of 

 the Yorkshire Philosophical Society. ( With a Plate.) „ 243 



XLI. A new Theory of the Resistance of Fluids, compared with 

 the best Experiments. By Mr. Thomas Tredgold, Civil Engineer; 

 Hon. M. Inst. Civ. En., and of the Liter, and Phil. Society of New-. 

 castle-upon-Tyne. ( With a Plate.) 249 



XLII. On Mr. Herapath's Second Attack on Lagrange's Method ; 

 by a /3 262 



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

 Bicheno, Esq., F.R.S., Sec. L.S., &c 265 



XLIV. Examination of a gelatinous Substance found in a damp 

 Meadow; — as a Contribution to the Knowledge of the Meteors called 

 Shooting-Stars. By Dr. R. Brandes 271 



XLV. Description of a Percussion Rifle, igniting by a Spring in- 

 stead of aLock. By Lieut.-Col. Miller, F.R.S 277 



XL VI. Account of an improved Form of Apparatus for exhi- 

 biting M. Clement Desormes's Experiments on Currents of Air, &c. 

 By Robert Younge, Esq 182 



XLVII. Of the Insect called Oistros by the Ancients, and of the 

 true Species intended by them under this Appellation: in reply to 

 the Observations of W. S. MacLeay, Esq., and the French Natural- 

 ists. To which is added, A Description of a new Species of Cutere- 

 bra. By Bracy Clark, F.L.S., and Foreign Member of the Royal 

 Academy of Sciences of Paris 283 



XL VI II. Notices respecting New Books: — Bakewell's Introduction 

 to Geology 289 



XLIX. Proceedings of Learned Societies: — Linnaean Society; 

 Geological Society ; Proceedings at the Friday Evening Meetings of 

 the Royal Institution of Great Britain; Royal Academy of Sciences 

 of Paris 290—307 



Obituary :— Sir J. E. Smith 307 



L. Intelligence and Miscellaneous Articles: — Analysis of Alcohol, 

 xEther, &c. ; New Patents ; Meteorological Observations ; Tables, 

 ice 309—320 



• # * 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. 



