CONTENTS. vil 
‘ Page 
Sir D. Brewster’s Observations on the Lines of the Solar Spec- 
trum, and on those produced by the Earth’s Atmosphere, 
and by the Action of Nitrous Acid Gas .....-.+--+-.--- 384 
Mr. W.S. B. Woolhouse on the Theory of Vanishing Fractions, 
in Reply to the Observations of Professor Young ........ 393 
Mr. E. Solly’s further Experiments on Conducting Power for 
Electricity ee. . ~~ sup» = fale Sate OSU, 1 Ia oe -. 400 
Reviews, and Notices respecting New Books: — Young's 
Theory and Solution of Algebraic Equations .......... 402 
Weigmann’s Herpetologia Mexicana ........+.+++++- 410 
Cooper’s Flora Metropolitana ........-.+00++- +1008 411 
Samouelle’s Entomologist’s Useful Compendium, 2nd Edit. 412 
Proceedings of the Royal Society.........-...--+++40-: 412 
aS TSS SE en eek Sate ac 423 
Royal Society of Edinburgh—Dr. Hope's 
Address on presenting the Keith Medal to Prof. Forbes, for 
his Experiments on the Refraction and Polarization of Heat 424 
Cambridge Philosophical Society ...... 429 
Camden Philosophical Institution ...... 43) 
Sir John F. W. Herschel’s Views on Scientific and General 
Education, applied to the proposed System of Instruction in 
the South-African College ........ 22-25. -e eee ee ee -» 432 
On the Aurora Borealis of November 18, 1835, as witnesse 
at Collumpton in Devonshire, by N.S. Heineken=.:.4::... . 439 
Lieut. Lecount’s Reply to Mr. Barlow............+---00.- 439 
Botanical Society of Edinburgh ...........--.4---00---- 440 
Inquiry relative to Dr. Pemberton’s Translation and Illustra- 
tions of Newton’s Principia, by Prof. Rigaud ............ 44] 
On Suberic Acid and its Combinations ................ 22 443 
Phloridzine;—Thebaia, a new Alkali in Opium............ 444 
New Renal Calculus........-- PSE As RO. PUNTO US 2 SS 446 
Solidification of Carbonic Acid ................42 eee. 446 
Arsenovinic Acid—Meteorological Observations 
NUMBER XLIX.—JUNE. 
Prof. Forbes on the Mathematical Form of the Gothic Pendent 449 
Rev. Prof. Ritchie's Experimental and Physical Researches in 
Electricity and Magnetism .......... ee a ee 455 
M. Cauchy on a New Formula for solving the Problem of In- 
terpolation in a Manner applicable to Physical Investigations 459 
Sir D. Brewster on the Colours of Natural Bodies.......... 468 
Rev. J. H. Pratt on the Proposition that a Function of @ and 
can be developed in only one Series of Laplace’s Coeffi- 
cients; the Function being supposed not to become infinite 
between the Limits o and x of 6’ and o and 27 of W 
Mr. Faraday on a supposed new Sulphate and Oxide of An- 
TUMIOIY . sa te ewe ciclo eelabe + "5 nea. d he Remap a 26 © 476 
Mr. J. Nixon’s Table of observed Terrestrial Retractions .... 479 
Mr. J. Blackwall’s Characters of some undescribed Species of 
ATOM .....0000: posarvtengnicsahscerene Mare an vein Meee 
