VI CONTENTS OF VOL. L. FOURTH SERIES. 



Page 

 Experiments on the Plasticity of Ice, by Prof. Dr. Fr. Pfaff. 333 

 On Musical Consonance, by Professor Tyndall, F.B.S 336 



NUMBEB CCCXXXII.— NOVEMBER. 



Dr. J. Kerr on a new Belation between Electricity and Light : 



Dielectrified Media Birefringent 337 



Mr. H. A. Bowland on Magnetic Distribution 348 



Mr. O. J. Lodge on Nodes and Loops in connexion with Che- 

 mical Formulae 367 



Frederick Guthrie on Stationary Liquid Waves 377 



Sir William Thomson on the General Integration of Laplace's 



Differential Equation of the Tides 388 



Dr. W. B. Carpenter on Mr. Croll's " Crucial-Test " Argument. 402 

 Professor A. Stoletow on Kohlrausch's Determination of the 

 Absolute Value of the Siemens Mercury Unit of Electrical 



Besistance 404 



Notices respecting New Books : — 



Mr. W. Whitaker's Geological Survey of England and 

 Wales. Guide to the Geology of London and the 



Neighbourhood . . 406 



Proceedings of the Geological Society: — 



Prof. H. G. Seeley on the Femur of Cryptosaurus eumerus 409 

 Mr. H. Hicks on the Succession of the Ancient Bocks in 



the vicinity of St. David's, Pembrokeshire 409 



Messrs. J. Hopkinson and C. Lap worth on the Graptolites 



of the Arenig and Llandeilo Bocks of St. David's .... 410 

 Mr. H. F. Blanford on the Age and Correlations of the 



Plant-bearnig series of India 411 



The Bev. J. F. Blake on the Kimmeridge Clay of England. 412 

 Prof. H. G. Seeley on Pelobatochelys BlaTcei and other 



Vertebrate Fossils from the Kimmeridge Clay 412 



Mr. A. J. Jukes-Browne on the Cambridge Gault and 



Greensand . . , 412 



Artificially Crystallized Oxide of Zinc from a Blast-furnace, 



by Bichard Cowper, Associate of the Boyal School of Mines. 414 

 On the Chemical and Spectroscopic Characters of a New Metal 



(Gallium), by Lecoq de Boisbaudran 414 



On the Influence of Light upon the Conductivity of Crystalline 

 Selenium, by Werner Siemens 416 



NUMBEB CCCXXXIII.— DECEMBEB. 



Prof. B. Bunsen's Spectral-Analytical Besearches. (With a 



Plate.) 41 7 



Mr. G. Darwin on Maps of the World. (With a Plate.) 431 



Dr. G. F. Barker on a new Vertical-Lantern Galvanometer. . 434 



