This journal provides immediate access to some articles. Volume 16(6); June 15, 1930 Engineering BENDING OF CURVED TUBES PMCID: PMC526667 Genetics THE ORIGIN OF THE PLANTS OF MATERNAL TYPE WHICH OCCUR IN CONNECTION WITH INTERSPECIFIC HYBRIDIZATIONS PMCID: PMC526653 Mathematics GROUP OF ISOMORPHISMS OF AN ABELIAN GROUP PMCID: PMC526658 COALESCENCE OF PARTS OF A COMPLEX PMCID: PMC526659 AN EXTENSION OF THE ALEXANDER DUALITY THEOREM PMCID: PMC526660 Physics MORE COMPLETE DISCUSSION OF THE TIME-DEPENDENCE OF THE NON-STATIC LINE ELEMENT FOR THE UNIVERSE PMCID: PMC526661 THE SIGNIFICANCE OF RECENT COSMIC-RAY EXPERIMENTS PMCID: PMC526662 MOTION ON A LATTICE PMCID: PMC526663 THE ABSORPTION COEFFICIENT OF HARD γ-RAYS PMCID: PMC526664 Psychology ON THE CONDITIONS OF ELICITATION OF CERTAIN EATING REFLEXES PMCID: PMC526665 THE ENERGY REQUIREMENTS OF INTENSE MENTAL EFFORT PMCID: PMC526666 Zoölogy MELANOPHORE PULSATIONS IN THE ISOLATED SCALES OF FUNDULUS HETEROCLITUS PMCID: PMC526654 DIURNAL RHYTHM OF THE DISTAL PIGMENT CELLS IN THE EYES OF CERTAIN CRUSTACEANS PMCID: PMC526655 THE COLOR CHANGES OF THE TREE TOAD IN RELATION TO NERVOUS AND HUMORAL CONTROL PMCID: PMC526656 Correction EQUILIBRIUM CONSTANTS OF REACTIONS INVOLVING HYDROXYL: A CORRECTION PMCID: PMC526657 Corrects: THE EQUILIBRIUM CONSTANTS OF REACTIONS INVOLVING HYDROXYL. Proc Natl Acad Sci U S A. 1929 September 15; 15(9): 705–709. Journal Matter Administrative content — journal masthead, notices, indexes, etc. | ||