Vlll CONTENTS OP VOL. XLIX. FOURTH SERIES. 



Page 



Mr. T. Belt on the Steppes of Siberia 479 



Mr. S. Allport on the Microscopic Structure and Compo- 

 sition of British Carboniferous Dolerites 479 



Mr. D. Mackintosh on Boulders 480 



Mr. A. Liversidge on the Bingera Diamond-fields 480 



Mr. Gr. Krefft on the working of the Molar Teeth of the 



Diprotodon 481 



On the Spectrum of the Aurora, by J. Band Capron 481 



On the determination of the quantity of Magnetism of a Mag- 

 net, by R. Blondlot 482 



On Camacho's New Electromagnet, by John Trowbridge, S.D. 

 Harv. Coll 484 



Index 485 



PLATES. 



I. II. Illustrative of Mr. Piazzi Smyth's Paper on Carbon and Hydro- 

 carbon in the Modern Spectroscope. 



III. IV. V. VI. Illustrative of Mr. J. Rand Capron's Paper on the Com- 

 parison of some Tube and other Spectra with the Spectrum of 

 the Aurora. 



VII. Illustrative of Dr. H. F. Weber's Paper on the Specific Heat of the 



Elements Carbon, Boron, and Silicon. 



VIII. Illustrative of Prof. G. C. Foster's Paper on Graphical Methods of 



solving certain simple Electrical Problems. 



IX. X. Illustrative of Messrs. G. C. Foster and O. J. Lodge's Paper on 



the Flow of Electricity in a uniform plane conducting Surface. 



