The Origin, Growth and Significance of the Mental Hygiene Movement.

The Origin, Growth and Significance of the Mental Scientific Apparatus and Laboratory Methods: Hygiene Movement: DR. WILLiAM A. WHITE ............ 77 A Simple Method for the Germination of Oospores Periodicals for Electrical Engineers: PROFESSOR J. of Sclerospora Graminicola: PROFESSOR MAKOTO K. McNrALY and C. D. CROSNO ......................... 81 HIURA. A Practical Flagella and Capsule Stain Scientific Events: for Bacteria: Da. HARRY D. BAILEY ............................. 95 The Bayleigh Collection at the South Kensington Special Articles: Museum; The New Scientific Laboratories at the An Attempt to Produce Mutations by the Use of University of Chicago; Summer Meeting of the Electrticty: PROFESSOR W. R. HORLACHER. The Botanical Society of Ameriea; First Awards of Fecundity of the Oyster: DR. PAUL S. GALTSOhF. the Pack Forest Education Board; Appointments The Oil Absorption of Shell Eggs: T. L. SWENin the U. S. Geological Survey . ........................ 84 SON aRd H. H. MoTTER N.96 T.. L . 96 Scientific Notes and News ..................86..ON.and.H..II..............................96 Discussion: Science News. x The Magnetic Poles of the Earth and the Birth of the Moon: DR. OLIVER JuSTIN LEE. Effect of Water on Triboelectric Luminescence with MerSCIENCE: A Weekly Journal devoted to the Advanceoury in Glass: THOMAS S. LOGAN and DR. ROGER ment of Science, edited by J. MCKEEN CATTELL and pubK. TAYLOR. Gas Discharge Wave-length List in lished every Friday by the Extreme Ultra-violet: JANET M. MACINNES and JOSEPH C. BOYCE. More about a Uniform THE SCIENCE PRESS Bibliographic System: DR. J. L. ST. JOHN. Attack by a Screech Owl: W. W. CHAPMAN. MarNew York City: Grand Central Terml mosa as a Stowaway Again: DR. G. E. POTTER ....... 89 Lancaster, Pa. Garrison, N. Y. Quotations: Annual Subscription, $6.00 Single Copies, 15 Cts. The Peking Skull ..... ....... 92 SCIENCE is the official organ of the American AssociaScientific Books: tion for the Advancement of Science. Information regardOsborn on the Titanotheres: PROFESSOR ALFRD ing membership inthe Association, may be secured from the offlice of the permanent secretary, in the Smithsonian S.ROMER ...... ........................................ 92 Institution Building, Washington, D.C.