vi 
CONTENTS 
PAGE 
New Analyses of Echinoderms By F.W. Clarke and R. M. Kamm 401 
The Behavior on Hydrolysis of the Simplest Secondary Nucleoside on Thymine 
By Treat B. Johnson and Sidney E. Hadley 418 
The Molecular Weights of the Triarylmethyls 
By M. Comber g and C. S. Schoepfle 457 
On the Presence of Albumoses in Extracts of the Posterior Lobe of the Hypo- 
physis Cerebri By John J. Abel and M. C. Pincoffs 507 
Two Laws Governing the Ionization of Strong Electrolytes in Dilute Solu- 
tions AND A New Rule for Determining Equivalent Conductance at Infi- 
nite Dilution Derived from Conductivity Measurements with Extremely 
Diluted Solutions of Potassium Chloride By Edward W. Washburn 569 
The Crystal Structure of Chalcopyrite Determined by X-Rays 
By Charles L. Burdick and James H. Ellis 644 
The Spectra of Isotopes and the Vibration of Electrons in the Atom 
By William D. Harkins and Lester Aronberg 710 
AGRICULTURE 
The Importance of the Water Contained in the Deeper Portions of the Subsoil 
By F. J Alway and G. R. McDole 257 
The Proteins of the Peanut, Arachis Hypogaea 
By Carl O. Johns and D. Breese Jones 365 
Physiological Effect on Growth and Reproduction of Rations Balanced from 
Restricted Sources 
By E. B. Hart, E. V. McCollum, H. Steenbock, and G. C. Humphrey 374 
Daily Variation of Water and Dry Matter in the Leaves of Corn and the 
Sorghums By Edwin C. Miller 427 
GEOLOGY AND PALEONTOLOGY 
Physiographic Subdivision of the United States By Nevin M. Fenneman 17 
Terracing of Bajada Belts By Charles Keyes 33 
Atlantis and the Permanency of the North Atlantic Ocean Bottom 
By Charles Schuchert 65 
The Gravimetric Survey of the United States By William Bowie 171 
Petrified Coals and Their Bearing on the Problem of the Origin of Coals 
By Edward C. Jeffrey 206 
The Age of the Bolivian Andes By Edward W. Berry 283 
Large Current-Ripples as Indicators of Paleogeography. .By Walter H. Bucher 285 
Pressure Phenomena Accompanying the Growth of Crystals. . .By Stephen Taber 297 
The Geology of the Fiji Islands By Wilbur G. Foye 305 
The Structure of High-Standing Atolls By W. M. Davis 473 
The Isostatic Subsidence of Volcanic Islands ByW.M. Davis 649 
Sublacustrine Glacial Erosion in Montana By W. M. Davis 696 
MINERALOGY AND PETROLOGY 
A CONIMBUTION TO THE PETROGRAPHY OF THE ISLAND OF B A WE AN, NETHERLANDS 
Indies By J. P. Iddings and E. W. Morley 105 
A Contribution to the Petrog^phy of Southern Celebes 
By J. P. Iddings and E, W. Morley 592 
