CO 



CONTENTS OF VOL. XLIV. 



(FOURTH SERIES.) 



NUMBER CCXC— JULY 1872. 



rage 



Mr. J. Croll on What determines Molecular Motion ?— the Fun- 

 damental Problem of Nature ^ 



Dr. A. M. Mayer on a new Lantern-Galvanometer 25 



Canon Moseley on the steady Flow of a Liquid. (With a Plate.) 30 



Mr. S. Taylor on Variations of Pitch in Beats 56 



The Hon. J. W. Strutt on Mr. Moon's Views on Gaseous Pres- 

 sure • 



Prof. A. Cayley on a Bicyclic Chuck o-> 



Notices respecting New Books : — 



The Right Rev. J, W. Colenso and the Rev. J. Hunter s 

 Introductory Algebra, containing the chief rules in the 

 first part of Colenso's Elements of Algebra simplified ; 



with additional illustrations &g • ^7 



Archdeacon Pratt's Treatise on Attractions, Laplace's 



Functions, and the Figure of the Earth 68 



Proceedings of the Royal Institution : — 



Mr. W. Spottiswoode on Optical Phenomena produced by 



Crystals submitted to Circularly Polarized Light 69 



Proceedings of the Royal Society : — 



Dr. J. H. Gladstone and Mr. A. Tribe on the Decompo- 

 sition of Water by Zinc in conjunction with a more Ne- 

 gative Metal • • • • '^^ 



On the Influence of Pressure on the Lines of the Spectrum, by 



M. L. Cailletet •. • • ^6 



Further Researches on the Reflection of Heat, by M. P. Desains. 77 

 On Electrical Pyrometry, by Lieut. Abney, R.E., F.R.A.S., 

 F.C.S., Assistant Instructor in Telegraphy, S.M.E., Chatham. 80 



NUMBER CCXCI.— AUGUST. 



M. E. Edlund on the Nature of Electricity 81 



Mr. R. Moon's Reply to some Remarks of the Hon. J. W. 



Strutt on Gaseous Pressure • 101 



Dr. J. W. Draper's Researches in Actino-Chemistry. — Memoir 

 First. On the Distribution of Heat in the Spectrum. (With 

 a Plate.) ^04 



