CONTENTS 
V 
PAGE 
Means of Measuring the Speed of Projectiles in Flight By C. G. Abbot 388 
A Vapor-Free Vacuum Seal By A.E. Pfund 521 
The Displacement of the Gravitating Needle in its Dependence on Atmo- 
spheric Temperatures By Carl Barus 547 
Radiationless Orbits By Edwin Bidwell Wilson 588 
The Effect upon the Atom of the Passage of an Alpha Ray Through It 
By R. A. Millikan, V. H. Gottschalk and M. J. Kelly 591 
CHEMISTRY 
The Inorganic Constituents of Lobster Shells 
By Frank Wigglesworth Clarke and George Steiger 6 
The Ternary System CaO-MgO-Si02 By J. B. Ferguson and H. E. Merwin 16 
On Some Metallic Derivatives of Ethyl Thioglycollate By Charles A. Rouiller. 145 
An Electromagnetic Hypothesis of the Kinetics of Heterogeneous Equilib- 
rium, and of the Structure of Liquids By William D. Harkins 152 
Hydrogen Overvoltage By Duncan A. Maclnnes and Leon Adler 160 
The Structure of Atoms and the Octet Theory of Valence . . By Irving Langmuir 252 
Some Applications of the Variation of Hydrogen Overvoltage with the Pres- 
sure By D. A. Maclnnes attd W. A. Contieri 321 
Ethylene Chlorhydrin By M. Gomberg 424 
Studies of the Constitution of Steel By Edward D. Campbell 426 
Influence of Ions on the Electrification and Rate of Diffusion of Water 
Through Membranes By Jacques Loeb 440 
The Ozone Form OF Hydrogen By Gerald L. Wendt 5 IS 
The Change of Molecular Kinetic Energy into Molecular Potential Energy: 
The Entropy Principle and Molecular Association. . . By William D. Harkins 539 
New Measurements of the Vapor Pressure of Mercury. . .By Alan W. C. Menzies 558 
Cohesion, Internal Pressure, Adhesion, Tensile Strength, Tensile Energy, 
and Molecular Attraction By William D. Harkins 562 
The Adhesion Between Mercury, Water, and Organic Substances, and the 
Fundamental Principles of Flotation By William D. Harkins 569 
Metallic Salts of Pyrrol, Indol and Carbazol By Edward C. Franklin 580 
GEOLOGY AND PALEONTOLOGY 
On Some Fundamentals of Pre-Cambrian Paleo-Geography . By Rudolph Ruedemann 1 
The Percentage Number of Meteorite Falls and Finds Considered with Ref- 
erence TO Their Varying Basicity By George P. Merrill 37 
Falklandia By J,M. Clarke 102 
Seventeen Skeletons of Moropus; Probable Habits of this Animal 
By Henry Fairfield Osborn 250 
Pal^emastodon, The Ancestors of the Long- J a wed Mastodons Only 
By Henry Fairfield Osborn 265 
Discoidal Structure of the Lithosphere By Bailey Willis 377 
BOTANY 
The Cause of Proliferation in Begonia Phyllomaniaca By Erwin F. Smith 36 
Bud Variation By A.B. Stout 130 
The Growth Rate of an Annual Plant Helianthus . By H. R. Reed and R. H. Holland 135 
Some Orienting Effects of Monochromatic Lights of Equal Intensities on 
Fucus Spores and Rhizoids By Annie May Hurd 201 
Phenomena of Cell Division in the Cambium of Arborescent Gymnosperms and 
Their Cytological Significance By Irving W. Bailey 283 
