CONTENTS. yii 



NUMBER XXIII.— NOVEMBER. 



Page 



Mr. Ivory's Answer to an Article by Mr. Henry Meikle, pub- 

 lished in No. VII. of the Quarterly Journal of Science 321 



Mr. Addison's Remarks on the Influence of Terrestrial Radia- 

 tion in determining the Site of Malaria 326 



Mr. Graham's Account of the Formation of Aleoates, Definite 

 Compounds of Salts and Alcohol analogous to the Hydrates 331 



Capt. Kater on the Luminous Zone observed in the Heavens 

 on the 29th of September last 337 



Expression for the Time of Vibration of a simple Pendulum in 

 a Circular Arc 338 



A Letter to William Morgan, Esq. F.R.S. on the Experience 

 of the Equitable Society 339 



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

 Genera of the Lepidoptera of Europe ; &c. [continued) .... 343 



Capt. Cullen's Notice of the Geological Features of a Route 

 from Madras to Bellary, in April and May 1822 (continued) 355 



Prof. Airy in reply to Mr. Galbraith's Remarks on some late 

 Computations of the Earth's Ellipticity 364? 



Dr. Tiarks on Mr. Dalby's Method of finding the Difference of 

 Longitude between two Points of a Geodetical Line on a 

 Spheroid, from the Latitude of those Points and the Azi- 

 muths of the Geodetical Line at the same 364 



New Books: — Wallace's Elements of Algebra; — Lea's De- 

 scription of Six New Species of the Genus Unio 370 — 372 



Proceedings of the Royal Geological Society of Cornwall. . . . 374 



Royal Academy of Sciences of Paris. . . . 377 



Commemoration of the Second Centenary of the Birth.day of 

 John Ray 379 



Agency of Carbonic Acid in decomposing Water by the Con- 

 tact of Iron 381 



Conducting Power of Metals for Electricity 382 



Conducting Power of different Fluids for Voltaic Electricity — 

 Hypophosphorous Acid and Hypophosphites 383 



Collecting Air for Analysis — Chloride of Sodium and Silver — 

 M. Berzelius's Observations on Amber, h 384 



Influence of Magnetism upon Chemical Action — Influence of 

 Gum-Arabic in the Precipitation of Lead by Sulphates — 

 Combination of Chlorine with Prussiate of Potash 385 



Preparation of PureMalate of Lead — Mr. Trevelyan's Descrip- 

 tion of the Winch Bridge, the oldest Suspension Bridge in 

 England 386 



Chlorophseite discovered in Northumberland — Novaculite. . . . 387 



Chelmsford Philosophical Institution 388 



Dr. Forster on the Zodiacal Light of the 29th of September, as 

 it appeared from Chelmsford 389 



Solar Spots 390 



The Planet Venus— Aurora Borealis 592 



Aurora Borealis? 393 



Mr. 



