CONTENTS OF VOL. IV. — FOURTH SERIES. VU 



Page 



On the Salts of Antimonic Acid, by L. HefFter 398 



Meteorological Observations for September 1852 399 



Table 400 



NUMBER XXVIL— DECEMBER. 



M. H. Helmholtz on Sir David Brewster's New Analysis of 

 Solar Light 401 



M. R. Clausius on the Colours of a Jet of Steam and of the 

 Atmosphere 416 



Mr. J. P. Hennessy on some Demonstrations in Geometry . . 41? 



Dr. Tyndall on the Reduction of Temperatures by Electricity. 

 (With a Plate.) 419 



Prof. Thomson on the Dynamical Theory of Heat (continued) . 424 



Mr. G. B. Jerrard on the possibility of solving Equations of 

 any degree however elevated (continued) 434 



Prof. De Morgan on Indirect Demonstration 435 



Prof. Challis on the Principles of Hydrodynamics (continued). . 438 



Mr. R. Adie on the relation of Magnetism and Diamagnetism 

 to the Colour of Bodies 451 



Mr. W. J. M. Rankine on the Non-polarization of the Aurora 

 Borealis 452 



Mr. J. Napier on Copper Smelting. — Calcination of the Ores 

 {continued) 453 



Proceedings of the Royal Society 465 



New Method of precipitating Oxide of Tin and separating it 

 from other bodies, and of combining it with Silk, Woollen 

 and Cotton Fabrics, by J. Lowenthal 476 



Remark on Art. LVIIl. (of Phil. Mag. for November) by Mr. 

 Sylvester, " that the Non-existence of real Roots in Analytic 

 Geometry corresponds to the reductio adabsurdum of Euclid," 

 by S. M. Drach 479 



Meteorological Observations for October 1852 479 



Table 480 



NUMBER XXVIIL— SUPPLEMENT TO VOL. IV. 



Mr. J. P. Joule and Prof. Thomson on the Thermal Effects 

 experienced by Air in rushing through small Apertures. . . . 481 



Mr. J. Cockle on the Method of Symmetric Products 492 



Dr. Andrews's Note on the Heat of Chemical Combination . . 497 

 Mr. W. R. Grove on the Electro- chemical Polarity of Gases. 



(With a Plate.) 498. 



Additional Note on the dark discharge, July 9, 1852 . . 514 

 Mr. A. Cayley's Demonstration of a Theorem relating to the 

 Products of Sums of Squares 515 



