This journal provides immediate access to some articles. Volume 2(4); April 1916 Anthropology The Genetic Relations of Certain Forms in American Aboriginal Art PMCID: PMC1090988 Article Preliminary Report upon the Possibility of Controlling the Land Slides Adjacent to the Panama Canal PMCID: PMC1090983 Astronomy Discovery of Eight Variable Stellar Spectra PMCID: PMC1090984 Systematic Motion among Stars of the Helium Type PMCID: PMC1090986 The Situation in Regard to Rowland's Preliminary Table of Solar Spectrum Wave-Lengths PMCID: PMC1090989 Changes in the Form of the Nebula N. G. C. 2261 PMCID: PMC1090990 Botany The Nature of Mechanical Stimulation PMCID: PMC1090993 Chemistry The Abundance of the Elements in Relation to the Hydrogen-Helium Structure of the Atoms PMCID: PMC1090987 Genetics Hereditary Reaction-System Relations: An Extension of Mendelian Concepts PMCID: PMC1090994 Size Inheritance in Guinea-Pig Crosses PMCID: PMC1090998 Mathematics On the Linear Dependence of Functions of Several Variables, and Certain Completely Integrable Systems of Partial Differential Equations PMCID: PMC1090985 Point Sets and Allied Cremona Groups: Part II PMCID: PMC1090995 On a Theorem of Lucas PMCID: PMC1090996 Interpretation of the Simplest Integral Invariant of Projective Geometry PMCID: PMC1090997 Paleontology On the Presence of a Median Eye in Trilobites PMCID: PMC1090992 Zoology On the Effect of Removal of the Pronephros of the Amphibian Embryo PMCID: PMC1090991 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||