

SUPPLEMENTARY NUMBER. 



CONTENTS. 



LIX. The Formation of Meteorites, and Volcanic Agency. Bv 

 Prof. G. Tschermak, Director of the Imperial Mineralogical Museum 



of Vienna pa 



LX. On the Nebular Hypothesis.- -II. Interaction. By Plij 



Earle Chase, Professor of Philosophy in Haverford College 50 



LXI. On the Simultaneous Sounding of two Notes. By Dr. Ru- 

 dolph Konig, Paris 51 



LXII. On the General Theory of Duplex Telegraphy. By Louis 



Schwendler '. 



LXIII. Remarks on the Discovery of Gallium. BvD.Mendelejeff. 54: 

 LXIV. On Unitation. — VI. Some of the Applications and Deve- 

 lopments of the General Formula (continued). By W. H. Walenn, 



Mem. Phys. Soc 5 



LXV. Notices respecting New Books : — ' Reliquiae Aquitanicae,' 

 being contributions to the Archaeology and Palaeontology of Perigord, 

 &c. By Edouard Lartet and Henry Christy. Edited by Professor 



T. Rupert Jones, F.R.S., F.G.S 



LXVI. Proceedings of Learned Societies : — 

 Geological Society : — Dr. Dawson on the Phosphates of the 

 Laurentian and Cambrian Rocks of Canada; Mr. II. B. 

 Woodward on the Gravels, Sands, and other Superficial 

 Deposits in the Neighbourhood of Newton-Abbot; Mr. R. 

 N. Worth on certain Alluvial Deposits associated with the 

 Plymouth Limestone ; Prof. A. C. Ramsay on the Physical 

 History of the Dee, Wales ; Mr. J. W. Judd on the Ancient 



Volcano of the District of Schemnitz, Hungary 558-5 



LXVII. Intelligence and Miscellaneous Articles : — 



On the Effect of Thin Plates of Iron used as Armatures to 

 Electromagnets, by John Trowbridge, S.D., Harvard College, 



U.S 



"Feldspar" and "Feldstone" versus "Felspar" and "Felstone." 

 On the Displacement of the Lines in the Spectra of the Stars, 



produced by their Motion in Space, by Father Secchi 5 



On a simple and very accurate Method of tuning two Forks to 

 unison, by Robert Spice, F.C.S 5 



Index 5 



With Title-page, Contents, &c ; 



&c. 



iiiL5 



*** It is requested that all Communications for this Work may be addresse 



?ost-paid, to the Care of Messrs. Taylor and Francis, Printing- Office R4 

 Aon Court, Fleet Street, London. 



