CONTENTS OF VOL. XXX.— THIRD SERIES. Vll 



Page 

 Sugar in Healthy Blood 378 



Chemical Action of Light 378 



On some Compounds of Cyanogen, by M. Ad. Wurtz 378 



Researches on Hydrates, Stannic and Wetastannic Acids, by 



M. E. Fremy '. 380 



On Sulphoxiphos%'inic Acid and its Compounds, by M. Cloez. . 382 



On Anhydrous Hydrofluoric Acid 382 



Meteorological Observations for March 1847 383 



Table 384 



NUMBER CCm.-JUNE. 



Mr. I. B. Cooke on the Use of a double Circuit in the measure- 

 ment of Electrical Forces. (With a Plate.) 385 



M. A. Descloizeaux's Physical and Geological Observations 

 on the principal Geysirs of Iceland 391 



Mr. R. Porrett on the existence of a New Vegeto-Alkali in Gun- 

 Cotton 409 



On some new Researches in Animal Chemistry. Extracted from 

 a Letter from Professor Liebig to Dr. A. W. Hofmann .... 412 



Dr. J. S. Muspratt on the Salts of Sulphurous Acid 414 



Mr. T. Rowney's Analysis of the Bohemian Glass as found in 

 the Combustion Tubes employed in Organic Analysis 421 



Prof. J. R. Young on a Generalization of a Theorem of Euler 

 in reference to the Products of the Sums of Squares 424 



Mr. W. Crum on a Method for the Analysis of Bodies contain- 

 ing Nitric Acid, and its appHcation to Explosive Cotton. . . . 426 



Sir D. Brewster on the Conversion of Relief by Inverted Vision 432 



Sir G. C. Haughton's Experiments proving the common nature 

 of Magnetism, Cohesion, Adhesion and Viscosity 437 



Prof. Sir W. R. Hamilton on Quaternions ; or on a New Sy- 

 stem of Imaginaries in Algebra 458 



Sir D. Brewster's Observations on the Analysis of the Spectrum 

 by Absorption 461 



On the Preparation of the Aramoniaco-Magnesian Phosphate 

 from Urine, by M. Boussingault 462 



Chemical Researches on the Yolk of Eggs 463 



On Plaster of Paris, by M. Plessy 464 



NUMBER CCIV.— SUPPLEMENT TO VOL. XXX. 



Prof. Dove on the Phaenomena exhibited by Polarized Light when 



its plane of polarization is rapidly rotated 4G5 



Prof. Dove on the Depolarization of Light 469 



