This journal provides immediate access to some articles. Volume 6(3); July 1931 Articles ABSORPTION OF MINERAL ELEMENTS BY PLANTS IN RELATION TO SOIL PROBLEMS PMCID: PMC440107 INFLUENCE OF ACETIC, PROPIONIC, NORMAL BUTYRIC AND SULPHURIC ACIDS AND POTASSIUM ACETATE ON ELONGATION OF PRIMARY ROOTS OF SEEDLINGS OF WHITE LUPINE PMCID: PMC440108 LIGHT SOURCES AND LIGHT MEASUREMENTS PMCID: PMC440109 SOME EFFECTS OF ACETYLENE ON THE RIPENING PROCESSES OF BANANAS PMCID: PMC440110 WATER-SUPPLYING POWER OF THE SOIL UNDER DIFFERENT SPECIES OF GRASS AND WITH DIFFERENT RATES OF WATER APPLICATION PMCID: PMC440111 MOVEMENT OF WATER IN PLANTS AS AFFECTED BY A MUTUAL RELATION BETWEEN THE HYDROSTATIC AND PNEUMATIC SYSTEMS PMCID: PMC440112 EXTERNAL POLARITY POTENTIALS IN THE APEX OF THE DOUGLAS FIR BEFORE AND AFTER MECHANICAL STIMULATION PMCID: PMC440113 SEASONAL CHANGES IN TOTAL, SOLUBLE, SOLUBLE-PROTEIN, NON-PROTEIN, AND INSOLUBLE NITROGEN IN CURRENT YEAR'S SHOOTS OF BARTLETT PEAR PMCID: PMC440114 STUDIES ON PARENCHYMATOUS AND VASCULAR PLANT TISSUES, SOME ANALYTICAL AND SPECIFIC GRAVITY DATA PMCID: PMC440115 PERMEABILITY OF THE SKIN OF APPLES AS MEASURED BY EVAPORATION LOSS PMCID: PMC440116 RESPIRATION STUDIES OF STRAWBERRIES PMCID: PMC440117 EFFECT OF MANGANESE, COPPER AND ZINC ON THE GROWTH OF YEAST PMCID: PMC440118 INFLUENCE OF DRY SOIL ON ROOT EXTENSION PMCID: PMC440119 COMPARISON OF METHODS OF DETERMINING MOISTURE IN CORN TISSUES PMCID: PMC440120 EFFECTS OF HIGH SOIL MOISTURE AND LACK OF SOIL AERATION UPON FRUITING BEHAVIOR OF YOUNG COTTON PLANTS PMCID: PMC440121 Brief Papers: PROOF OF THE ESSENTIAL NATURE OF COPPER FOR HIGHER GREEN PLANTS PMCID: PMC440122 Note Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||