CONTENTS OF VOL. VI. FOURTH SERIES. 



On the pretended Occurrence of Iodine in Milk, Eggs, and the 



Atmospheric Air, by Dr. Lohmeyer 237 



Meteorological Observations for July 1853 239 



Table 240 



NUMBER XXXIX.— OCTOBER. 



M. Viard on the Electro-chemical Deportment of Oxygen. 



(With a Plate.) 241 



Mr. A. Cayley's Note on a Question in the Theory of Proba- 

 bilities 259 



Sir David Brewster on the Production of Crystalline Structure 



in Crystallized Powders, by Compression and Traction .... 260 

 Sir David Brewster on the Optical Phenomena and Crystalliza- 

 tion of Tourmaline, Titanium, and Quartz, within Mica, Ame- 

 thyst, and Topaz. (With a Plate.) 265 



Prof. Rammelsberg on Selenide of Mercury from the Hartz . . 272 

 Mr. R. Carmichael on Laplace's Equation, its Analogues, and 



the Calculus of Imaginaries 273 



M. W. Haidinger on the Iodo-quinine Compound, investigated 



in its optical Relations by Dr. Herapath and Professor Stokes. 284 

 Dr. Draper on a new Method for the Determination of Urea. . . . 290 

 Mr. J. J. Sylvester on the explicit Values of Sturm's Quotients. 293 

 Mr. J. J. Sylvester on a Fundamental Rule in the Algorithm 



of Continued Fractions 297 



Proceedings of the Royal Society 300 



Royal Institution . „, .... 307 



On an Improved Regulator for Galvanic Coil Apparatuses and 



Magneto-electric Machines, by G. Gore, Esq 309 



Meteorological Observations for August 1853 311 



Table 312 



NUMBER XL.— NOVEMBER. 



Prof. Helmholtz on the Methods of Measuring very Small Por- 

 tions of Time, and their application to Physiological Purposes. 313 

 Mr. A. Cayley on the Homographic Transformation of a Sur- 

 face of the Second Order into itself 326 



Prof. Magnus on the Condensation of Gases by Smooth Surfaces. 334 



Prof. Challis on some Theorems in Hydrodynamics , 338 



Mr. F. M. Lyte on an Instrument for taking Soundings .... 344 

 Dr. Herapath on the Manufacture of large available Crystals of 

 Sulphate of Iodo-quinine (Herapathite) for Optical Purposes 



as Artificial Tourmalines 346 



Mr. C.J. Hargreave's Applications of the Calculus of Opera- 

 tions to Algebraical Expansions and Theorems 351 



