CONTENTS OF VOL. XXXV. — THIRD SERIES. Vll 



Page 

 British Seas ; together with a few general remarks on the 

 phsenomena of Vital Phosphorescence 401 



Prof. De la Rive on the Vibratory Movements which Magnetic 

 and Non-magnetic Bodies experience under the influence of 

 external and transmitted Electric Currents 422 



Mr. J. Cockle on Systems of Algebra involving more than one 

 Imaginary ; and on Equations of the Fifth Degree 434 



Mr. E. J. Lowe on a remarkable Solar Phsenomenon seen at 

 the Villa, Beeston near Nottingham, October 22. 1849. ... 437 



M. G. Bontemps's Inquiries on some modifications in the Co- 

 louring of Glass by Metallic Oxides 439 



M. A. De la Rive on the Cause of Aurorae Boreales, being an 

 Extract from a Letter to M. Regnault 446 



Prof. B. Silliman's Descriptions and Analyses of several Ame- 

 rican Minerals 450 



I. Species of the Family Mica 450 



II. On Unionite 457 



III. On Monrolite 458 



IV. On the identity of Sillimanite,Fibrolite and Bucholzite 



with Kyanite 459 



V. On the Boltonite of Shepard, and Thomson's Bisilicate 



of Magnesia 462 



VI. On Nuttallite 464 



On the State in which Arsenic exists in the Deposit from Mi- 

 neral Waters, by M. J. L. Lassaigne 465 



Easy Mode of measuring Solar Objects, by W. Pringle 467 



Natural Sources and new Mode of preparing Sulphuric Acid, by 



M. C. Blondeau 467 



Notes on the California Gold Region, by the Rev. C. S. Lyman 470 

 Combinations of Oil of Turpentine and Water, by M. H. Deville 474 

 Action of Phosphoric Acid on the Hydrates of Oil of Turpen- 

 tine, by M. H. Deville 477 



On the Influence of Boracic Acid on Vitrification 478 



Meteorological Observations for October 1849 479 



Table 480 



NUMBER CCXXXIX.— SUPPLEMENT TO VOL. XXXV. 



MM. E. de la Provostaye and P. Desainson the Rotation of the 



Plane of Polarization of Heat by Magnetism 481 



Prof. B. Silliman on a Granular Albite associated with Corun- 

 dum, and on the Indianite of Bournon 484 



Mr. S. M. Drach's Supplementary Considerations to his Epicy- 



clical Papers (Phil. Mag. June to July 1849) 487 



Mr. R. Phillips on Electricity and Steam 490 



Mr. T. S. Davies on Geometry and Geometers. No. IV 497 



Mr. S. Beswick's Illustrations of a Method for computing Mag- 

 netic Declination, on the principle proposed by Prof. Gauss 511 



