The Sixteenth Annual Meeting of the Pacific Division.

The American Association for the Advancement of Scientific Books: Science: van Vleck 's Theory of Electric and Magnetic The Sixteenth Annual Meeting of the Pacific DiviSusceptibilities: DR. PHILIP M. MORSE .............................. 326 sion: DR. J. MURRAY LUCK ........................... 303 Scientific Apparatus and Laboratory Methods: A Universal Precision Stimulator: OTTO H. A. Obituary: SCHmITT and DR. FRANCIS 0. SCHMITT ............ 328 Ernest Julius Wilczynski: PROFESSOR G. A. BLISS. Special Articles: Barton Warren Evermann: DR. G. DALLAS HANNA 316 Experiments upon the Cause of Whooping Cough: DRS. ARNOLD R. RICH, PERRIN H. LONG, J. HowScientific Events: ARD BROWN, ELEANOR A. BLISS and L. EMMETT The Painted Desert and the Petrifed Forest NaHoLT, JR. An Encephalomyelitis in the Chicken: tional Monument; The Mellon Institute TechnoDR. E. ELIZABETH JONES ............................. 330 chemical lectu,res; A Course in Alnimal Sociology Sin at Harvard University; The Century of Progress ene ews.10 Exposition and the American Ceramic Society ...... 318 SCIENCE: A Weekly Journal devoted to the AdvanceScientific Notes and News...320 ment of Science, edited by J. MCKEEN CATTELL and published every Friday by Discussion: The Shovelnosed Sturgeon in the Arkansas River: THE SCIENCE PRESS DR. E. W. GUDGER. Determination of the Relative New York City: Grand Central Terminal Volumes of Two' Combining Streams from Their newt CenraaTrinal Temperatures: RONALD L. IvES. Dermatitis ProLancaster, Pa. Garrison, N. Y. duced by Encelia californica Nutt: DR. H. J. Annual Subscription, $6.00 Single Copies, 15 Ots. WEBBER . ............................................... 323 SCIENCE is the official organ of the American AssociaQuotations: tion for the Advancement of Science. Information regardProfessor Arthur H. Compton's Studies of Cosmic ing membership in the Association may be secured from Profsso Arhur . Cmptn ~the office of the permanent secretary, in the Smithsonian Rays ....................................... 325 Institution Building, Washington, D. C.