CONTENTS. V 



Page 



NUMBER XXXIII.— SEPTEMBER. 



Mr. Brown's Additional Remarks on Active Molecules 161 



Mr. Prideaux on the Atomic Weight of Oxalic Acid and of 

 Mercury 166 



Dr. Hare on the Construction and Applications of the im- 

 proved Sliding-Rod Eudiometer and of the Volumescope . . 171 



Prof. Encke on Hadley's Sextant 181 



Mr. Children's Abstract of the Characters of Ochsenheimer's 

 Genera of the Lepidoptera of Europe ; &c. {continued) .... 188 



Mr. MacLeay's Letter to J. E. Bicheno, Esq., F.R.S., in exa- 

 mination of his Paper " On Systems and Methods" in the 

 Linnean Transactions 199 



Mr. De la Beche's Note on the Differences, either Original or 

 consequent on Disturbance, wliich are observable in the Se- 

 condary Stratified Rocks 213 



Rev. W. V. Vernon on a Discovery of Fossil Bones in a Marl- 

 Pit near North Cliff 225 



Queries respecting Mr. Hall's Original Discovery of Achroma- 

 tic Telescopes 233 



Dr. Daubeny on the Discovery of Iodine and Bromine in cer- 

 tain Salt Springs and Mineral Waters in England 235 



Aspartic Acid and Aspartates 226 



Atomic Weight of Iodine and Bromine — Pectic Acid and the 

 Juice of Carrots — Scientific Books 237 



Remarkable Coldness of the late Spring — Meteorological Ob- 

 servations 238 



Meteorological Observations made by Mr. Booth at the Gar- 

 den of the Horticultural Society at Chiswick, near London, 

 by Mr. Giddy at Penzance, Dr. Burney at Gosport, and Mr. 

 Veall, at Boston 240 



NUMBER XXXIV.- OCTOBER. 



Mr. De la Beche's Notice on the Excavation of Valleys .... 241 



Mr. Lubbock on some Properties of Curves of the Second 

 Order 249 



Mr. Yarrell on the supposed Identity of Whitebait and Shad. . 253 



Mr. Sang on a Property possessed in common by the Primitives 

 and Derivatives of the Product of two Monome Functions. . 262 



Prof. Bessel's Formulae and Tables for calculating the Apparent 

 Places of Fixed Stars 267 



Mr. Ivory's Remarks on an Article in the^* Bulletin des Sciences 

 Mallicmatiqiies;' for June 1829, § 269 272 



Notice of the .'\rrival of Twenty-four of the Summer Birds of 

 Passage in the Neighbourhood of Carlisle, during the Year 

 18'J!J ; Willi Observations, cS:c 276 



Mr. R. l'hilli{)fi on tlie Oxides of Manganese, in a Letter ad- 

 dressed to Dr. E. Turner 281 



Mr. Murray on the Discovery of Iodine and Bromine in the 



Mineral Waters of England , 283 



Mr. 



