CONTENTS OF VOL. XXV.— THIRD SERIES. VII 



Page 

 Mr. A. Cayley's Investigation of the Transformation of certain 



Elliptic Functions 352 



Mr. R. Moon on Polarization and Double Refraction 354 



The Rev. B. Bronwin on the Variable Elements of a Disturbed 

 Planet, and the Equations of its Motion on the Plane of the 



Orbit 357 



Dr. J. Blyth on the Composition of Narcotine, and some of its 

 products of Decomposition by the action of Bichloride of 



Platinum 363 



Mr. J. Napier's Observations upon the Decomposition of the 



Double Cyanides by an Electric Current 379 



Mr. J. P. Marrian on Sonorous Phaenomena in Electro-Magnets. 382 

 Dr. Daubeny's Lines of Inquiry connected with the Theory of 



Agriculture 384 



On Paraselense seen at High Field House, Lenton, Nottingham- 

 shire, by E. J. Lowe, Esq 390 



Analysis of the Purple Powder of Cassius, by M. Figuier .... 392 



On Fulminating Gold, by M. Figuier 393 



On the Teroxide of Gold, by M. Figuier 394 



Properties of Opianic Acid 395 



Nature and composition of some Opianates 396 



Preparation of Opianic Acid, by M. Wohler 396 



On Silicic Others, by M. Ebelmen 397 



Trigonometrical Notation 398 



Corrections in the Translation of M. Wartmann's Paper .... 398 



Meteorological Observations for September 1844 399 



Table 400 



NUMBER CLXVIII.— DECEMBER. 



Prof, J. R. Young's Observations on Mr. Graves's Theory of 

 Imaginary Logarithms 401 



Mr. H. Perigal on the Probable Mode of Constructing the Py- 

 ramids ; introduced by Letters relating to the History of the 

 subject, addressed to Lieut.-Col. Sabine, Lieut.-Col. Dansey, 

 and the Author 404 



Dr. R. King on the Fish River of the Polar Sea 412 



Dr. Leeson's Observations on the Circular Polarization of Light 

 by transmission through Fluids 416 



Mr. A. Smee on the Cause of the Reduction of Metals when 

 solutions of their salts are subjected to the Galvanic Current 434 



Mr. J. J. Sylvester on the Existence of Absolute Criteria for 

 determining the Roots of Numerical Equations 442 



Mr. G. Shaw on some Photographic Phaenomena 445 



Dr. Liebig on the Constitution of the Urine in Man and Carni- 

 vorous Animals 453 



On the Essential Oil of Betula Lenta and on Gualtherine, by 

 W. Procter 480 



