This journal provides immediate access to some articles. Volume 34(6); June 1948 Bacteriology The Effect of Irradiation on Recombination in Escherichia Coli PMCID: PMC1079100 Strain Specificity and Production of Antibiotic Sub-stances: VIII. Production of a Grisein-Like Antibiotic by a Strain of Streptomyces Griseus PMCID: PMC1079101 Engineering The Gas Turbine and Its Significance as a Prime Mover PMCID: PMC1079102 Genetics New Facts on Sex Determination in Drosophila Melanogaster PMCID: PMC1079103 Pigments of Yellow-Eyed Races of the Black-Eyed Susan (Rudbeckia Hirta) PMCID: PMC1079104 Mathematics On the Existence of Solutions of Certain Equations in a Finite Field PMCID: PMC1079105 Groups, Categories and Duality PMCID: PMC1079106 Methods of Symmetry and Critical Points of Harmonic Functions PMCID: PMC1079107 Pathology Tuberculosis in Germany PMCID: PMC1079108 Physics Some Relations Between the F's and F2's of X-Ray Diffraction PMCID: PMC1079109 Stability of the Laminar Flow Through a Straight Pipe of Circular Cross-Section to Infinitesimal Disturbances Which are Symmetrical about the Axis of the Pipe PMCID: PMC1079110 Psychology The Mechanism of Flow for Solid Metals PMCID: PMC1079111 Zoology Evidence for Aging as a Consequence of Growth Cessation PMCID: PMC1079112 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||