CONTENTS OF VOL. VI. 



(FIFTH SEEIES), 



NUMBER XXX1Y.— JULY 1878. 



Page 



Dr. J. Croll on the Origin of Nebulae 1 



Mr. T. Bayley on the Analysis of 'Alloys containing Copper, 



Zinc, and Nickel 14 



Dr. W. Ramsay on Picoline and its Derivatives 19 



Frederick Guthrie on Salt Solutions and Attached Water . . 35 

 Prof. Hughes on the Physical Action of the Microphone .... 44 

 Mr. R. Meldola on a Cause for the Appearance of Bright 



Lines in the Solar Spectrum 50 



Dr. E. J. Mills's Researches in Thermometry 62 



Mr. R. H. M. Bosanquet on the Relation between the Notes 



of Open and Stopped Pipes 63 



Notices respecting New Books : — 



The Rev. R. M. Ferrers's Elementary Treatise on Sphe- 

 rical Harmonics and Subjects connected with them . . 66 

 Mr. H. F. Blanford's First and Second Parts of the Indian 

 Meteorologist's Yade Mecum ; and Tables for the Re- 

 duction of Meteorological Observations in India .... 67 

 Proceedings of the Geological Society : — 



Mr. W. A. E. L T ssher on the Chronological Value of the 



Triassic Strata of the South-western Counties 68 



Mr. G. Maw on an Unconformable Break at the Base of 



the Cambrian Rocks near Llauberis 69 



Mr. J. A. Phillips on the so-called Greenstones of Central 



and Eastern Cornwall 69 



Mr. N. H. Winchell on the Recession of the Falls of St. 



Anthonv 70 



Capt, PI. W. Feilden and Mr. C. E. De Ranee on the 

 Geological results of the Polar Expedition under 

 Admiral Sir George Nares 71 



