Some Chemical Aspects of the Origin of Petroleum.

The American Association for the Advancement of Scientific Apparatus and Laboratory Methods: Science: An Adjustable Drop-control for Burettes: DR. Some Chemical Aspects of the Origin of PetroFRANKLIN HOLLANDER ............... .......................... 45 leum: PROFESSOR S. C. LIND .................................... .....19 Special Articles: Some Recent Aspects of Nematology: DR. N. A. The Relationship between Electrical Differences of COBB.22 Potential in the Skin and Normtal Basal MIetabolism: CHARLOTTE PURDY, A. FRANCES JOHNSON The Challenge of Plant Viruss Diferentiation and and DR. CHARLES SHEARD. Studies in Certain Classification: PROFESSOR JAMES JOHNSON and DR. Factors Affecting the Resistance of Plants to InIs1MG A. HOGGAN ......................................... 29 sect Pests: Da. EDWARD PHILPOTT MUMFORD............... 46 Scientific Events: Vivisection in England; Beorganization of the NaScience News.X tional Parks Association; The Bowdoin Institute of Natural Science; Officers of the American Association for the Advancement of Science ........................ 32 SCIENCE: A Weekly Journal devoted to the Advancemeint of Science, edited by J. MCKEEN CATTELL and pubScientific Notes and News .................................. ... 35 lished every Friday b