The Origin of the Earth's Land Formations.

Radioactivity: SIR JOSEPH THOMSON .................................... 207 sulin: DR. F. D. W. LUKENS and DR. F. C. DOHAN. The Origin of the Earth's Land Formations: DR. C. The Neuro-Motor Mechanism of the Small Blood D. PERRINE 210 Vessels of the Frog: GEORGE P. FULTON and DR. Scientific Events: BRENTON R. LUTZ. Egg-white Injury in Chicks The Biological Research Institute of the Zoologand Its Relationship to a Deficiency of Vitamin H ical Society of San Diego; The Great Smoky Moun(Biotin): ROBERT E. EAKIN, WILLIAM A. Mctains National Park; The Marine Biological LabKINLEY and PROFESSOR ROGER J. WILLIAMS ..................222 oratory at Woods Hole; The Detroit Meeting of Scientific Apparatus and Laboratory Methods: the American Chemical Society. Recent Deaths 212 Molecular Weight by Isothermic Distillation: PROScientific Notes and News ........................................................................ 214 FESSOR JOSEPH B. NIEDERL and ARTHUR M. LEVY. Discussion: A Simple Stain for Tissue Cultures: JANE STANLEY The First Thousand athem atical orks Printed CRAIG ..................................................................................................................... 225 in America: PROFESSOR G. A. MILLER. Practical SuggestionsforReducing the Labor of Indexing a Science News ...................................................................................................... 10 Text-book: DR. LEON HUGH WARREN. The Incidence of Hydrogen Sulfide at Kilauea Solfatara Preceding the 1940 Mauna Loa Volcanic Activity: SCIENCE: A Weekly Journal devoted to the AdvanceDR. JOHN H. PAYNE and DR. STANLEY S. BALLARD 216 ment of Science, edited by J. MCKEEN CATTELL and pubScientific Books: wished every Friday by A Geological Expedition to the Sunda Islands: PROFESSOR REGINALD A. DALY. The Invertebrates: THE SCIENCE PRESS DR. ILLIAM F. D LLER ..................................................................... 219 Lancaster Pa. Garrison, N. Y. Dn. WILLIAM F. ILLER 219 Lancaster, Pa. Garrison, N. Y. Reports: Summarized Proceedings of the American AssoNew York City: Grand Central Terminal ciation for the Advancement of Science from 1934 Annual Subscription, $6.00 Single Copies, 15 Cts. to 1940: DR. F. R. MOULTON ............................................................ 221SCIENCE is the official organ of the American Associ Special Articles: tion for the Advancement of Science. Information regardMorphological and Functional Recovery of the Paning membership in the Association may be secured from the office of the permanent secretary in the Smithsonian creatic Islands in Diabetic Cats Treated with InInstitution Building, Washington, D. C.