CONTENTS OF VOL. VIII.—SIXTH SERIES. Vil 
Page 
Proceedings of the Geological Society :— 
Mr. W.G. Fearnsides on the Occurrence of a Limestone 
with Upper Gault Fossils at Barnwell, near Cambridge. 664 
Mr. J. V. Elsden on the Age of the Llyn-Padarn Dykes. 664 
Mr. L. Richardson on a Non-Sequence between the 
Keuper and Rhetic Series in North-West Gloucester- 
SMe ame W ORCESLETSMITE J. o,f. 6 2 ele ee ok le we 666 
Prof. W. 8. Boulton on the Igneous Rocks of Pontesford 
RISTO PS NIVe, Vee i. he Bh iby Bone a, chops ote eS ewe ere 8's 667 
Dr. C. Davison on the Caernarvon Earthquake of June 
fern, 1903, andiits Accessory Shocks~.....:../.... 668 
NUMBER XLVITI.— DECEMBER. 
Mr. A. S. Eve on the Secondary Radiation caused by the 
Pee Miran OF Radin, Pha. OE aloe eee dks 669 
Mr. W. Sutherland on the Electric Origin of Gravitation and 
Memrese cic VEAOTIOUISO . kN. cee oe eee ee ee eee ee 685 
Mr. J. H. Jeans: Determination of the Size of Molecules 
momeine tcimetic Theory of Gases. ......05- 0060. e eee 692 
Mr. J. H. Jeans on the Persistence of Molecular Velocities 
Geicwhemetnic Theory o:)Gases ...<.. ccc. eee ee ee 700 
Prof. I. Traube: Contribution to the Theories on Osmosis, 
Seememnvecamid NavCdsisy 22.0 ti en ae oe 704 
Prof. A. A. Michelson on the Relative Motion of Earth and 
Pee ee ees ec an Pe RP, ae Meee 716 
Prof. W. H. Bragg on the Absorption of a Rays, and on the 
Classification of the a Rays from Radium. (Plate XVIII.) 719 
Prof. W. H. Bragg and Mr. R. Kleeman on the Ionization 
Mremmeen@n ACIS. ibe tree oe. Swale Sec ce dace es 726 
Prof. J. S. Townsend and Mr. H. E. Hurst on the Genesis of 
Ions by the Motion of Positive Ions, and a Theory of 
MEARS OUTTA: oa. hose eels doe = whine wees ws 735 
Extract from a Letter to Lord Kelvin from Profs. E. W. 
eeemrenend BC. Willer ee as lk eee te ws ee ole 7993 
Notices respecting New Books :— 
Thomas Preston’s The Theory of Heat ......:....... Tot 
Biers Blbchrigue “Ali: 6. 20k, ea cee ce ees 756 
N. V. Karpen’s Recherches sur |’Effet Magnétique des 
Corps Electrisés en Mouvement .................. 757 
P. Pettinelli’s Saggio di Una Teoria Generale dei Feno- 
meni Naturali; and Un Nuovo Procedimento per 
Trovare Molte Relazioni Note ed Ignote fra le Quantita 
Fisiche . 
E. Gerrard’s Lecons sur l’Electricité ................ 
R. Marcolongo’s Teoria Matematica dello Equilibrio dei 
OTS UL ASICS TG oe oo a a nie a a 758 
A. Macfarlane’s Bibliography of Quaternions ........ 758 
MUN ALE Oe Sse alas ee oor UR Sis Se a nae Se 759 
