v1 CONTENTS OF VOL. VIII.—SIXTH SERIES. 
Page 
Mr. T. J. Bowlker on the Lengthening of the Spark from an 
Induction-Coil by the Aid of Auxiliary Wires .......... 487 
Mr. E. F. Burton on a Radioactive Gas from Crude Petroleum. 498 
Prof. W. M°F. Orr on Clausius’ Theorem for Irreversible 
Cycles, and on the Increase of Entropy ..........--+-+- 509 
Lord Kelvin: Plan of a Combination of Atoms to have 
the Properties of Polonium or Radium ................ 528 
Lord Kelvin on Electric Insulation in “‘ Vacuum” ........ 534 
Prof. F. T. Trouton and Mr. A. O. Rankine on the Stretching 
and Torsion of Lead Wire beyond the Elastic Limit. 
Grdates KY, XOVe is ig eee es Satish ah we ieee he cike 538 
Mr. G. Jatfé on the Conductivity of Gases contained in Small 
ViSESCIS | G.. sea \a.a s Se we oon omg & ide an AN de meee ee ee 506 
Prof. H. Kayser on New Standards of Optical Wave- 
USTED diss is de in wet > pocgeee toh tact by pele eNeeeiae cats Gen 568 
Notices respecting New Books :— 
T. Mellard Reade’s The Evolution of Earth-Structure .. 572 
Mme. 8. Curie’s Untersuchungen iiber die Radioaktiven 
Substanzen 
NUMBER XLVII.—NOVEMBER. 
Prof. W. B. Morton and Mr. T. B. Vinycomb on the Vibrations 
of Strings excited by Plucking and by Resonance. (Plate 
Ah SO eee en re MN Pe 573 
Mr. C. A. B. Garrett on the Lateral Vibration of Bars. 
(Plate X VAL.) veces nin num mss ieee i he eee a 581 
Mr. A. G. M. Michell on the Limits of Economy of Material 
fi PF ramne-Sbr wb eS x < wie) pcre epebahe Ree ob ally oie inact ee 589 
Messrs. K. Aichi and T. Tanakadate on the Theory of the 
Rainbow due to a Circular Source of Light ............ 598 
Mr. A. 8S. Eve: Comparison of the Ionization produced 
in Gases by penetrating Rontgen and Radium Rays...... 610 
Hon. R. J. Strutt on the Radioactivity of Various Materials. 618 
Dr. W. M. Thornton on the Magnetization of Iron in Bulk.. 620 
Prof. E. Rutherford on the Slow Transformation Products of 
RANGA So. ye tiahin She Rieke Pyertis kee Tier ue kk Aare 636 
Mr. G. W. Walker on Saturation Currents in Lonization.... 650 
Notices respecting New Books :— 
I. Od Wy is, TeadiOMchiwaiy oc. ai dare te eteeede, sie nse a 3 659 
W. L. Jordan’s Astronomical and Historical Chronology 
in the battle of the Centuries tuck ee ..': s - ee 
A. Righi & B. Dessau’s Die Telegraphie Ohne Draht .. 661 
Hann’s Jelineks Psychrometer-Tafeln .............- 661 
W. A. Noyes’s Text-Book of Organic Chemistry ...... 662 
A. Righi’s La Moderna Teoria dei Fenomeni Fisici .... 662 
F. Loppé’s Essais Industriels des Machines Electriques 
et des Groupes Hlectravenes 4244)..cke 2h .!. +. ee 662 
A. Carnot’s Traite d’Analyse des Substances Minérales.. 663 
