CONTENTS OF VOL. XV.— FOURTH SERIES. VU 



NUMBER CII.-JUNE. 



Page 



M. Verdet on the Optical Properties developed in Transparent 



Bodies by the Action of Magnetism.— Part III ^^^ 



Dr. Joule on an improved Galvanometer . . ... •••.••••• 

 Prof. Chapman on the Assaying of Coals by ^he Blowpipe^ 433 



Mr R C. Carrington on the Evidence which the Observed 

 Motions of the Solar Spots offer for the Existence of an ^^^ 



Atmosphere surrounding the Sun. . . . . • _ 



Dr. Atkinson's Chemical Notices from Foreign Journals. . . . . 45^ 



M F Dellmann on the Observation of Atmospheric Electricity 460 

 m! a. De la Rive on the Rotation of the Electrical Light round ^^^ 

 the Pole of an Electro-magnet ..... . . . • •••„;• • ••■■{-^ 



Mr. J P. Gassiofs Description of a Ruhmkorff s Induction 



Apparatus, constructed by Mr. Ritchie, Boston, U.S 4bb 



Proceedings of the Royal Society :— 



Prof. W. Thomson on the Electro- dynamic Qualities ot ^^^ 



Prof.V! Thomson' on 'the Eiectric Conductivity of Com- 

 mercial Copper of various kinds ........... • • • „• ;^. 



Prof. W. Thomson and Dr. Joule on the ITiermal Effects ^^^ 



of Fluids in Motion 



Proceedings of the Geological Society :— 



Mr. H. Rosales on the Gold-diggmgs at Ballaarat . ..... 48^ 



Mr. J. C. Moore on a protrusion of Silurian Rock in the ^^^ 

 North of Ayrshire : "-," 'r^ ' ' \' ' e 



Mr. G. W. Ormerod on the Rock-basms in the Granite ot ^^^ 



M? I^Leckenby "on the Kelioways 'Ro'ck of the Yorkshire ^^^ 



Mr °N^T.'WetherelV on' the occurrence of Graphularia 



WethereUii in nodules from the London Clay and the Crag. 484 

 Mr. S. V. Wood on the Extraneous Fossils of the Red Crag. 4b.j 

 Proceedings o'f the Manchester Society :— 



Mr W. Fairbairn on the Strength of some alloys of Nickel 

 and Iron, similar in composition to Meteoric Iron .... 4bo 

 On the Torpidity of the Marmot, by G. Valentin . • -^ • ■ ; ; ^°° 

 On the Nitrurets of Tungsten and Molybdenum.byProf.Wohler. 488 



NUMBER cm.— SUPPLEMENT TO VOL. XV. 



MM. Bunsen and Schischkoff on the Chemical Theory of ^^^ 



Gunpowder. (With a Plate.) . ^p, 



Prof Miller's Crystallographic Notices • •, • • • • • • •• 



Mr R H. Scott's Analysis of Anorthite from a Dionte from ^^^ 



the Oural Mountains ,•,.';„■; i c.^i^cr^e i,v 



Mr. G. Gore on the Rotation of Metallic Tubes and Spheres by ^^^^ 



Electricity 



