The Growing Opportunities for Medical Research.

CONTENTS The Growing Opportunities for Medical Research: DR. LEWELLYS F. BARKER ........................................... 449 The American Association for the Advancement of Science: The Trend of Thought in Physics: PROFESSOR W. F. G. SWANN ............. 452 The White Indians of the San Blas and Darien: DR. REGINALD G. HARRIS .................... ....................... 460 The James-Simpson-Roosevelt Expedition of the Field Museum of Natural History: DR. WILFRED H. OSGOOD ......................................... 461 Scientific Events: The International Congress of Forestry; Work of the Northeastern Forest Experiment Station; Sigma Xi and the California Institute of Technwlogy; The Third National Colloid Symposium; Brandegee .................................... ScientificNotes and News ............. ....................... 464 University and Educational Notes .................................... 467 Discussion and Correspondence: Series in the Arc Spectrum of Nitrogen: DR. C. C. KIESS. The Undertow: DR. T. T. QUIRKE. Origin of the Loess of the Palouse Region, Washington: RAY C. TREASHER. The Stem of Magnolia as a Laboratory Type: A. W. HAUPT.................. 468 Scientiflc Books: Bliss on the Calculus of Variations: DR. F. D. MURNAGHAN........ 470