The Social Sciences and National Planning.

The American Association for the Advancement of Scientific Apparatus and Laboratory Methods: Science: Intratracheal Inoculations in the Rat: L. JounThe Social Sciences and National Planning: PRODONAIS and DR. W. J. NUNGESTER. The PreservaFESSOR WESLEY C. MITCHELL .. ......................... 55 tion of Cartilage: V. BROCK. Permanent AcetoScientiflc Events: carmine Preparations: JOHN B. BUCK .......... 74 The Agricultural Problems of Mexico; The LindSpecial Articles: bergh Collection of Spores in Arctic Areas; Grants The Similarity between Fasciations in Plants and in Aid of Research Administered by the National Tumors in Animals and their Genetic Basis: DR. Besearch Council; Annual Meeting of the MetalDONALD F. JONES. Mottled Enamel of Deciduous lurgical Advisory Board; The Directorship of the Teeth: DR. MARGARET CAMMACK SMITH and PROAmerican Museum of Natural History; Recent FESSOR H. V. SMITH. The Disinhibition of ExDeaths ...................................... 62 perimental Extinction in the White Bat: PROFESScientiic Notes and News..............65 SOR WALTER S. HuNTER ................................ 75 Scion: Science News .......................... ...... 5 Dis uhssion: The Dutch Elm Disease in Connecticut: DR. G. P. CLINNTON and F. A. MCCORMICK. The Belgian SCIENCE: A Weekly Journal devoted to the AdvanceNational Research Council: A. J. DEMPSTER. ment of Science, edited by J. McKEEN CATTELL and pubOak Trees and the White Grub Menace: PROlished every Friday by FESSOR C. L. FLUKE, JR., and PAUL 0. RITCHER. The Biology of the Black Widow Spider: WM. THE SCIENCE PRESS L. JELLISON and DR. C. B. PHILIP. A New New York City: Grand Central Terminal South Dakota Meteorite: PROFESSOR CLEOPHAS C. Lancaster, Pa. Garrison, N. Y. o'HARRA. Ground Water and Forest Belt: PRESIAnnual Subscription, $6.00 Single Copies, 15 Cts. DENT KARL T. COMPTON ............................... 68 SCIENCE is the official organ of the American AssociaSientifivc Books: tion for the Advancement of Science. Information regardInfant Behavior: PROFESSOR JOHN E. ANDERSON. ing membership in the Association may be secured from Mathematical Physics: Da. N. I. ADAMS, JR 73 the office of t phepermanent secretary, in the Smithsonian 73 Institution Building, Washington, D. C.