This journal provides immediate access to some articles. Volume 12(8); August 1926 Chemistry The Electrical Conductivity of Liquid Cyanogen Bromide PMCID: PMC1084659 On the Free Energy of Hydration of Ions PMCID: PMC1084660 Genetics An Effect of Temperature and Age on Crossing-Over in the First Chromosome of Drosophila Melanogaster PMCID: PMC1084661 Geology The Organic Content of Lake Water PMCID: PMC1084657 The Stratigraphic Horizon of the Beds Containing Lepidocyclina Chaperi on Haut Chagres, Panama PMCID: PMC1084658 Paleontology Foraminifera from the Upper Eocene Deposits of the Coast of Ecuador PMCID: PMC1084662 Physics The Absorption of X-Rays in Crystalline Compounds PMCID: PMC1084647 Acoustic Pressures in Case of Soap Bubbles PMCID: PMC1084648 Acoustic Pressure Promoted by Coöperating Quill Tubes without Pinholes PMCID: PMC1084649 Note on the Temperature Relations of Photo-Electric Emission and Thermionic Emission of Electrons PMCID: PMC1084650 The Dielectric Constant of Diatomic Dipole-Gases on the New Quantum Mechanics PMCID: PMC1084651 A Photo-Ionization Experiment with Hydrogen PMCID: PMC1084652 Series and Ionization Potentials in the Iron Spectrum PMCID: PMC1084653 The Location of the Electromotive Force in a Photo-Active Cell Containing a Fluorescent Electrolyte PMCID: PMC1084654 Remarks on Professor Lewis's Note on the Path of Light Quanta in an Interference Field PMCID: PMC1084655 The Mean Free Path of Electrons in Mercury Vapor PMCID: PMC1084656 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||