This journal provides immediate access to some articles. Volume 17(7); July 1931 Chemistry Optical Sensitization PMCID: PMC1076075 Reversible Coagulation in Living Tissue: IV PMCID: PMC1076076 Genetics Uncomplicated Trisomic Inheritance of Purple Versus Red in Matthiola PMCID: PMC1076083 The Probable Origin of Oenothera Rubricalyx “Afterglow” on the Basis of the Segmental Interchange Theory PMCID: PMC1076084 Inheritance of Body Weight in Domestic Fowl PMCID: PMC1076085 Mathematics A Canonical Form for Real Matrices under Orthogonal Transformations PMCID: PMC1076079 Physics Wave Motion and the Equation of Continuity PMCID: PMC1076080 Electric Conductivity and Optical Absorption in Metals (Supplementary) PMCID: PMC1076081 Electromagnetic Fields Derived from Non-Commuting Potentials PMCID: PMC1076082 Zoölogy The Cupula of the Ear PMCID: PMC1076077 The Cilia of Naphthys Bucera PMCID: PMC1076078 Journal Matter Administrative content — journal masthead, notices, indexes, etc. | ||