What to Believe about Cosmic Rays.

The American Association for the Advancement of Scientific Apparatws and Laboratory Methods: Science: A Second Experimental Method for Increasing What to Believe about Cosmic Bays: DR. ROBERT Auditory Acuity: DR. WALTER HUGHSON. A A. MILLIKAN ........................................... 211 Simple Method for Making Low-Power PhotoCertain Aspects of Geologic Classifications and Cormiicrographs: F. MARTIN BROWN and LEIGH E. relations. II: PROFESSOR ROLLIN T. CHAMBERLIN 216 CHADWICK....................................... 232 Obituary: Collier Cobb: PROFESSOR Wm. F. PROUTY. Thomas Specil ArtiCles: Huston Macbride: DR. GEO. B. RiG .............................. 219 Selenite-A Criterion of Effective Wind Scour: Scientific Events: PROFESSOR KIRK BRYAN and PROFESSORWALTER Television in Great Britain; Exhibit of Minerals E. SCHOEWE. The Occurrence and Alvt.ty of at the Academy of Natural Sciences of PhiladelUrea-Splitting Bacteria in the Sea: DR. C. E. phia; Awards of the American Institute of Mining ZOBELL and CATHARINE B. FELTHAtc . A Growthand Metallurgical Engineers;The Harvard ArcheoInhibiting Su.bstance in Lettuce Seeds: DR. A. L. logical Expedition to Venezuela; The Thomas Alva SHUCK..........233 Edison Foundation; Fellowships of the American Science News .................................. 10 Association of University Women ............................ 220 Scientific Notes and News ...................... 223 Discussion: SCIENCE: A Weekly Journal devoted to the AdvanceAttitude Measurement and "The Dunlap Dtment of Science, edited by J. McKEEN CATTELL and publemma": DR. F. L. WELLS. Early Geography in l e r Northern Illinois: PROFESSOR DERWENT WHITTLElihed every Friday by SEY. A New Outlet for Unabridged Scientific THE SCIENCE PRESS Papers: DR. MILTON J. POLISSAR .................. 227 New York City: Grand Central Terminal Scientific Books: Ner Pa. Grio N. Y. Earth, Radio and the Stars: DR. J. A. FLEMING. Lanaster, Pa. Garrison, N. Y. Asteroidal and Cometary Orbits: DR. FRED L. Annual Subscription, $6.00 Single Copies, 15 Cts. WHIPPLE ... ....................................... 229 SCIENCE is the official organ of the American AssociaQuotations: tion for the Advancement of Science. Information regardA Message from the President of the American ing membership in the Association may be secured from the office of the permanent secretary, in the Smithsonian Chemical Society .. ............................231 Institution Building, Washington, D. C.