CONTENTS OF VOL. XV. SIXTH SERIES. V 
Page 
Dr. T. H. Havelock on certain Bessel Integrals and the Co- 
efficients of Mutual Induction of Coaxial Coils 332 
Lord Rayleigh on the Effect of a Prism on Newton's Rings. 345 
Mr. A. Stephenson on Mechanical Phosphorescence 352 
Prof. D. N. Mallik on Mutual Induction : 364 
Prof. E. Goldstein on the Canal-Kay G roup 372 
Prof. J. Joly on the Radioactivity of Sea-Water 385 
Notices respecting New Books : — 
Lerhbuch der Gerichtlichen Chemie 393 
Mr. A. Clark's The Polarity of Matter 394 
M. E. Fischer's Guide de Preparations Organiques a 
l'Usage des Etudiants 394 
Moritz von Rohr's Die Binokularen Instrumente 394 
Annuaire pour l'An 1908 395 
The Science Tear Book and Diary for 1908 395 
Prof. M. Brillouin's Lecons sur la Viscosite des Liquides 
et des Gaz 395 
Bulletin of the Bureau of Standards 396 
Intelligence and Miscellaneous Articles : — 
On the Evolution and Devolution of the Elements, by 
H. Eamage 396 
NUMBER LXXXVIIL— APRIL. 
Lord Kelvin on the Formation of Concrete Matter from 
, Atomic Origins 397 
Dr. G. Bakker on the Theory of Surface Forces. — III. The 
Physical Meaning of the Unstable Part of the Isotherm of 
James Thomson 413 
Prof. H. A. Bumstead on the Heating Effects produced by 
Rontgen Rays in Lead and Zinc 432 
Mr. G. A. Schott on the Frequencies of the Free Vibrations 
of Quasi-permanent Systems of Electrons, and on the 
Explanation of Spectrum Lines. — Part 1 438 
Prof. Percival Lowell on the Tores of Saturn 468 
Messrs. S. W. J. Smith and H. Moss on the Contact Potential 
Differences determined by means of Null Solutions 478 
Dr. J. Morrow on the Lateral Vibration of Bars supported 
at tw^o Points with One End overhanging 497 
Mr. W. C. M. Lewis on an Experimental Examination of 
Gibbs's Theory of Surface-Concentration, regarded as the 
Basis of Adsorption, with an Application to the Theory of 
Dyeing 499 
Mr. E. Buckingham on the Thermodynamic Corrections of 
the Nitrogen Scale. (Plates XV.-XVIL) 526 
