CONTENTS OF VOL. XIII. SIXTH SERIES. Vll 



Dr. J. T. Bottomley and Mr. E. A. King on Experiments 

 with Vacuum Gold-leat Electroscopes on the Mechanical 

 Temperature Effects in Rarefied Gases. (Plate XVII.) . . 747 

 Notices respecting New Books : — 



Sir Oliver Lodge's Electrons, or the Nature and 



Properties of Negative Electricity 759 



Memoir and Scientific Correspondence of the late Sir 



George Gabriel Stokes, Bart , 760 



Dr. W. Marshall "Watts's Index of Spectra : Appendix E. . 760 

 Proceedings of the Geological Society : — 



Prof. S. H. Reynolds on a Silurian Inlier in the Eastern 



Mendips \ 761 



Mr. J. A. Douglas on Changes of Physical Constants 

 which take place in certain Minerals and Igneous 

 Rocks, on the Passage from the Crystalline to the 

 Glassy State; with a short Note on Eutectic 



Mixtures 761 



Prof. T. G. Bonney on the Southern Origin attributed 



to the Northern Zone in the Savoy and Swiss Alps . . 762 

 Prof. J. B. Harrison on the Coral-Rocks of Barbados . . 763 



Index 764 



