CONTENTS 
V 
The Condensation and Evaporation of Gas Molecules By Irving Langmuir 141 
A Possible Function of the Ions in the Electric Conductivity of Metals 
By Edwin H. Hall 163 
The Magnetization of Iron, Nickel, and Cobalt by Rotation and the Nature of 
THE Magnetic Molecule By S. J. Barnett 178 
The Intensities of X-Rays of the L Series. . .By David L. Webster and Harry Clark 181 
New Data on the Phosphorescence of Certain Sulphides. (Discussing Meas- 
urements BY Drs. H. E. Howe, H. L. Howes, and Percy Hodge) 
By Edward L. Nichols 199 
A Re-determination of the Value of the Electron and of Related Constants 
By R.A. Millikan 231 
The Shapes of Group Molecules Forming the Surfaces of Liquids 
By Irving Langmuir 251 
The Laws of Elastico-Viscous Flow By A. A. Michelson 319 
A New Equation of Continuity By Frederick G. Keyes 323 
Displacement Interferometry in Connection with U-Tubes By Carl Barus 334 
Transverse Displacement Interferometry By Carl Barus 360 
The Stark Effect in Helium and Neon By Harry Nyquist 399 
The Triplet Series of Radium By Gladys A. Anslow and Janet T. Howell 409 
The Measurement of Small Angles by Displacement Interferometry 
By Carl Barus 412 
The Occurrence of Harmonics in the Infra-Red Absorption Spectra of Dia- 
tomic Gases By James B. Brinsmade and Edwin C. Kemhle 420 
The Loss in Energy of Wehnelt Cathodes by Electron Emission 
By W. Wilson 426 
Note on Complementary Fresnellian Fringes By Carl Barus 432 
The Displacement Interferometry of Long Distances By Carl Barus 436 
The Crystal Structure of Magnesium By A.W. Hull 470' 
A Determination of the Ratio of the Specific Heats of Hydrogen at 18° and 
— 190°C By Margaret C Shields 502 
Note on the Coefficient of Total Radiation of a Uniformly Heated Enclosure 
By W. W. Cohlentz. 504 
The Development of a Source for Standard Wavelengths and the Importance 
OF Their Fundamental Values. . .By Charles E. St. John and Harold D. Babcock 505 
Theoretical Relations in the Interferometry of Small Angles. . .By Carl Barus 563 
The Interferometry of Small Angles, etc. Methods by Direct and Reversed 
Superposed Spectra By Carl Barus 665 
Note on Interfermometer Methods of Measuring the Elastics of Small 
Bodies By Carl Barus 693 
CHEMISTRY 
Improvements in Calorimetric Combustion, and the Heat of Combustion of 
Toluene By Theodore W. Richards and Harold S. Davis 50 
A New Method of Transforming Esters of oi-Aminoacids into Their Corre- 
sponding IsoTHiocYANATEs By Treat B. Johnson and Arthur A. Ticknor 303 
Attempt to Separate the Isotopic Forms of Lead by Fractional Crystallization 
By Theodore W. Richards and Norris F. Hall 339 
A Kinetic Hypothesis to Explain the Function of Electrons in the Chemical 
Combination of Atoms By William A. Noyes 356 
The Equilibrium between Carbon Monoxide, Carbon Dioxide, Sulfur Dioxide, 
AND Free Sulfur By John B. Ferguson 371 
