VISIBLE PATTERNS OF SOUND.

Visible Patterns of Sound: RALPH K. PoTTER .i............ 463 M. SELLE. Concerning the Term "Race Differences " and the Concept " Culture ": DR. C. W. Obituary: WEIANT . ... ..... 484 Walter Bradford Cannon: DL CEcm K. DRINKER. Deaths and Memorials ................ 470 Scientific Books: Mainsprings of Civillation: Dli. WARRAIN S. Scientific Events: THOMPSON. Physical Geology: DR. HARRY S. Nuclear Physics and Chemistry at Harvard UniLADD. General Chetmistry: DR HUBERT N. ALYA. versity; The Research Corporation of New York; Books Received ............. 486 Freedom for Scientific Work; News from Abroad... 472 ~~~~~~~~~~~~~~~~~~~~~~~~~~Science News ................... .-................. .......... ..... 12 Scientific Notes and News ............. ......................... 475