CONTENTS 
Page 
Physics. — Re-determination of the Value of the Electbon and of Related 
Constants By R. A. Millikan 231 
Genetics. — Body Pigmentation and Egg Production in the Fowl 
By /. Arthur Harris, A. F, Blakeslee and D. E. Warner 237 
Zoology. — ^Variability of Germ Cells of Sea Urchins . . By A. J, Goldfarb 241 
Zoology.-— Transplantation of Limbs By Ross G. Harrison 245 
Physics.—The Shapes of Group Molecules Forming the Surfaces of Liquids 
By Irving Langmuir 251 
Agriculture.— The Importance of the Water Contained in the Deeper Por- 
tions of the Subsoil By F.J. Alway and G. R. McDole 257 
Pathology. — ^The Transformation of Pseudoglobulin into Euglobulin . . . 
By William N. Berg 261 
Zoology. — A Case of Normal Embryonic Atresia of the Esophagus .... 
By H. E. Jordan 264 
Astronomy. — Studies of Magnitudes in Star Clusters. V. Further Evidence 
OF the Absence of Scattering of Light in Space \ . By Harlow Shapley 267 
Zoology. — The History of the Primordial Germ Cells in the Loggerhead 
Turtle Embryo ByH.E. Jordan 271 
Astronomy. — Studies of Magnitudes in Star Clusters. VI. The Relation of 
Blue Stars and Variables ^o Galactic Planes . . , By Harlow Shapley 276 
Anthropology. — ZvSi Chronology By Leslie Spier 280 
Geology. — ^The Age of the Bolivian Andes By Edward W. Berry 283 
Geology. — Large Current-Ripples as Indicators of Paleogeography .... 
By Walter H. Bucher 285 
Genetics. — ^The Bearing of Selection Experiments with Drosophila upon the 
Frequency of Germinal Changes . , . . By Edwin Carleton MacDowell 291 
Geology. — ^Pressure Phenomena Accompanying the Growth of Crystal . . 
By Stephen Taber 297 
Chemisty. — ^A New Method of Transforming Esters of a-AMiNOACiDS into 
their Corresponding Isothiocyanate 
By Treat B. Johnson and Arthur A. Ticknor 303 
Geology. — ^The Geology of the Fiji Islands By Wilbur G. Foye 305 
Genetics. — Dominance of Linked Factors as a Means of Accounting for 
Heterosis ^y Donald F. Jones 310 
Pathology. — Chemically Induced Crowngalls By Erwin F. Smith 312 
Mathematics.— Dynamical Systems with Two Degrees of Freedom . ... 
By George D. Birkhof 314 
National Research Council. — ^Membership of the Committees of the Council. 317 
