This journal provides immediate access to some articles. Volume 14(2); February 1928 Chemistry The Quantum Theory of Quasi-Unimolecular Gas Reactions PMCID: PMC1085388 The Theory of the Decomposition of Azomethane PMCID: PMC1085389 Fundamental Frequencies, Interatomic Forces and Molecular Properties PMCID: PMC1085390 The Effect of Intensive Drying on the Vapor Pressure and Vapor Density of Ammonium Chloride PMCID: PMC1085391 Genetics Genetic Evidence of a Selective Segregation of Chromosomes in a Second Species of Sciara (Diptera) PMCID: PMC1085394 The “Outside-In” Oenothera Flower, a New Morphological Type Produced by the Interaction of Two Recessive Mendelian Factors PMCID: PMC1085395 Linkage with Crossing-Over between Rubricalyx Buds and Old-Gold Flower Color in Oenothera PMCID: PMC1085396 Mathematics A New Proof of the Lefschetz Formula on Invariant Points PMCID: PMC1085397 Note on Projective Coördinates PMCID: PMC1085398 Projective Tensors and Connections PMCID: PMC1085399 Physics The Molecular Structures of Methane PMCID: PMC1085400 Additional Lines in the K Series of Molybdenum and the Natural Breadth of Spectral Lines PMCID: PMC1085401 The Correspondence Principle in the Statistical Interpretation of Quantum Mechanics PMCID: PMC1085402 Experiments with Modified Mucronate Electrodes PMCID: PMC1085403 The Mobilities of Gaseous Ions in H2S-H2 Mixtures PMCID: PMC1085404 Statistics Mendelian Inheritance with Assortive Mating PMCID: PMC1085393 Zoölogy Some Effects of Dietary Insufficiency in the Ciliate Didinium Nasutum PMCID: PMC1085392 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||