This journal provides immediate access to some articles. Volume 11(9); September 1925 Genetics Studies on Biochemical Differences between (+) and (-) Sexes in Mucors: 1. Tellurium Salts as Indicators of the Reduction Reaction PMCID: PMC1086112 Tetraploidy in Citrus PMCID: PMC1086113 Mathematics Arithmetization in the History of Mathematics PMCID: PMC1086116 Physics The Passage of Slow Canal Rays through Hydrogen PMCID: PMC1086118 Energy Transformations in an Unobstructed Air Current, in an Air Current Containing a Dry Obstacle, and in an Air Current Containing an Evaporating Surface; with Application to an Aerodynamic Psychrometer and to the Measurement of Atmospheric Humidity PMCID: PMC1086119 Note on the Experimental Determination of the Relative Intensities of Some of the Molybdenum and Copper K Series Lines and the Tungsten L Series Lines PMCID: PMC1086120 X-Rays Scattered by Molybdenum PMCID: PMC1086121 Ratio of Intensities of Unmodified and Modified Lines in Scattered X-Rays PMCID: PMC1086122 The Effect of Light on the Behavior of Selenium Contact Rectifiers PMCID: PMC1086123 The Acoustic Pressure in Tubes Capped by High Resistance Telephones, Vibrating in Different Phases PMCID: PMC1086124 Physiology Skin Temperature and Heat Loss PMCID: PMC1086117 Psychology Deviation from the Regular as an Art Principle PMCID: PMC1086114 The Rôle of Mental Measurement in the Discovery and Motivation of the Gifted Student PMCID: PMC1086115 Zoölogy Encystment and the Life Cycle in the Ciliate Didinium Nasutum PMCID: PMC1086111 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||