This journal provides immediate access to some articles. Volume 13(5); May 1927 Anthropology A Stratigraphic Study in the Gila-Salt Region, Arizona PMCID: PMC1084966 Chemistry A Quantitative Treatment of Deviations from Raoult's Law PMCID: PMC1084959 The Thermal Decomposition of Ozone PMCID: PMC1084960 Mathematics Concerning Points of a Continuous Curve That Are Not Accessible from Each Other PMCID: PMC1084961 Recent Progress of Investigations by Symbolical Methods of the Invariants of Bi-Ternary Quantics PMCID: PMC1084962 A Dynamical Theory of Economic Equilibrium PMCID: PMC1084963 On the Foundations of the Theory of Discontinuous Groups of Linear Transformations PMCID: PMC1084964 On the Formation of Groups of Linear Transformations by Combination PMCID: PMC1084965 Physics The Infra-Red Absorption Spectra of Acetylene (C2H4), Ethylene (C2H4) and Ethane (C2H6) PMCID: PMC1084967 The Spectrum of CO2 PMCID: PMC1084968 The Entropy of Radiation PMCID: PMC1084969 Linear Elements of the Electromagnetic Pinhole Graphs PMCID: PMC1084970 Thermionic Emission and the “Universal Constant” A PMCID: PMC1084971 Lagrangian Functions and Schrödinger's Rule PMCID: PMC1084972 Two Remarks on the Wave-Theory of Mechanics PMCID: PMC1084973 Heats of Condensation of Positive Ions and the Mechanism of the Mercury Arc PMCID: PMC1084974 Series Spectra of Silver-Lake Atoms PMCID: PMC1084975 Term-Structure and Zeeman Effect of the Arc Spectrum of Tin: (Preliminary Report) PMCID: PMC1084976 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||