CONTENTS OF VOL. XVII. 



(FOURTH SERIES.) 



NUMBER CXI.— JANUARY 1859. 



Page 



Prof. Petzval on the Camera Obscura 1 



The Rev. S. Haughton on some Rocks and Minerals from Cen- 

 tral India, including two new Species, Hislopite and Hun- 



terite ^ ^ 



Prof. Challis on the Central Motion of an Elastic Fluid ; and 



on the Theory of Tartini's Beats 21 



Mr. J. N. Hearder on the Atlantic Cable •_• 27 



Dr. Heddle's List of the Pseudomorphic Minerals found in 



Scotland * 42 



Mr. T. Belt's Inquiry into the Origin of Whirlwinds 47 



Biographical Notice of the late Richard Taylor, F.L.S.&c. . . 53 

 Proceedings of the Royal Society : — 



Sir Charles Lyell on the Formation of Continuous Tabular 



Masses of Stony Lava on steep slopes / " • • ^ 



Dr. Joule on some Thermo-dynamic Properties of Solids. . 61 

 Prof. W. Thomson on the Thermal Effect of drawing out 



a Film of Liquid ^^ 



Dr. Hofmann on Sulphocyanide of Phenyle 63 



Dr. Hofmann on the Action of Bibromide of Ethylene upon 



Aniline . . "" 



The Rev. G. Salmon on Curves of the Third Order 71 



Proceedings of the Geological Society : — 



Mr. J. Miller on the Succession of Rocks in the Northern 



Highlands 72 



Sir R. I. Murchison on the Geological Structure of the 



North of Scotland .• 72 



Prof. Huxley on the Stagonolepis Robertsoni of the Elgin 

 Sandstones ; and on the Foot-marks in the Sandstones 



of Cummingstone '^ 



Mr. S. H. Beckles on Fossil Foot-prints in the Old Red 



Sandstone at Cummingstone ' ' 



Thoughts on the Formation of the Tail of a Comet, by J. J. 



Waterston, Esq 78 



On the Uitlerence presented by the Prismatic Spectrum of the 

 Electric Light in vacuo at the Positive and Negative Poles, 

 by Professor Dove 79 



