This journal provides immediate access to some articles. Volume 2(3); March 1916 Anthropology Archaeological Explorations at Pecos, New Mexico PMCID: PMC1090961 Man and Metals PMCID: PMC1090962 The Failure and Revival of the Process of Pigmentation in the Human Skin PMCID: PMC1090970 Astronomy On the Observed Rotations of a Planetary Nebula PMCID: PMC1090963 A Short Period Cepheid with Variable Spectrum PMCID: PMC1090964 The Spectrum of δ Cephei PMCID: PMC1090965 Investigations in Stellar Spectroscopy: I. A Quantitative Method of Classifying Stellar Spectra PMCID: PMC1090966 Investigations in Stellar Spectroscopy: II. A Spectroscopic Method of Determining Stellar Parallaxes PMCID: PMC1090967 Investigations in Stellar Spectroscopy: III. Application of a Spectroscopic Method of Determining Stellar Distances to Stars of Measured Parallax PMCID: PMC1090968 Investigations in Stellar Spectroscopy: IV. Spectroscopic Evidence for the Existence of Two Classes of M Type Stars PMCID: PMC1090969 Geology The Mechanics of Intrusion of the Black Hills (S. D.) Precambrian Granite PMCID: PMC1090959 Banded Glacial Slates of Permo-carboniferous Age, Showing Possible Seasonal Variations in Deposition PMCID: PMC1090971 Geographic History of the San Juan Mountains Since the Close of the Mesozoic Era PMCID: PMC1090974 The Age of the Middle Atlantic Coast Upper Cretaceous Deposits PMCID: PMC1090975 Upper Cretaceous Floras of the World PMCID: PMC1090976 Mathematics An Extension of Feuerbach's Theorem PMCID: PMC1090972 Deformations of Transformations of Ribaucour PMCID: PMC1090973 Paleontology On the Fossil Algae of the Petroleum-Yielding Shales of the Green River Formation of Colorado and Utah PMCID: PMC1090960 Physics The Electromotive Force Produced by the Acceleration of Metals PMCID: PMC1090978 Zoology Observations on Ameba Feeding on Infusoria, and Their Bearing on the Surface-Tension Theory PMCID: PMC1090977 Correction The Results of Investigations of the Ecology of the Floridian and Bahaman Shoal-Water Corals PMCID: PMC1090979 Corrects: The Results of Investigations of the Ecology of the Floridian and Bahaman Shoal-Water Corals. Proc Natl Acad Sci U S A. 1916 February; 2(2): 95–100. Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||