This journal provides immediate access to some articles. Volume 15(3); July 1940 Articles STARCH FORMATION IN TOBACCO PLANTS DEFICIENT IN POTASSIUM PMCID: PMC437838 RELATION OF pH TO GROWTH IN CITRUS PMCID: PMC437839 THE BALANCE SHEET OF METABOLITES FOR POTATO DISCS SHOWING THE EFFECT OF SALTS AND DISSOLVED OXYGEN ON METABOLISM AT 23° C PMCID: PMC437840 EFFECT OF SOIL MOISTURE ON GROWTH AND TRANSPIRATION IN HELIANTHUS ANNUUS PMCID: PMC437841 STORAGE OF ROOT RESERVES IN RHODES GRASS PMCID: PMC437842 THE MINERAL COMPOSITION OF THE ALCOHOLIC EXTRACT OF POTATO LEAVES AND ITS RELATIONSHIP TO CROP YIELDS PMCID: PMC437843 SOME ASPECTS OF MINERAL NUTRITION IN RELATION TO BISON FLAX PMCID: PMC437844 AUXITHALS SYNTHESIZED BY SOME FILAMENTOUS FUNGI PMCID: PMC437845 MEASUREMENT OF THE RESPIRATORY QUOTIENT OF PLANT TISSUES IN A CONSTANT GASEOUS ENVIRONMENT PMCID: PMC437846 MICRO DETERMINATION OF SOME CONSTITUENTS OF PLANT ASH PMCID: PMC437847 RESPONSE OF EXCISED TOMATO ROOTS TO β (-4-METHYLTHIAZOLYL-5) -ALANINE PMCID: PMC437848 SPECIFICITY OF NICOTINIC ACID AS A GROWTH FACTOR FOR ISOLATED PEA ROOTS PMCID: PMC437849 Brief Papers: TRANSMISSION SPECTROGRAMS OF LEAF EXTRACTS PMCID: PMC437850 IMPROVEMENTS IN THE SIMPLIFIED METHOD FOR OSMOTIC MEASUREMENTS PMCID: PMC437851 ISOLATION OF THE ALKALOIDS, BERBERINE AND BERBAMINE, FROM MAHONIA SWASEYI PMCID: PMC437852 CRITICISM OF A RECENT PAPER ON THE PECTIC CONTENT OF PLANT MATERIALS PMCID: PMC437853 Note NOTES PMCID: PMC437854 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||