This journal provides immediate access to some articles. Volume 42(4); April 1956 Astronomy ELEMENT-BUILDING REACTIONS IN STARS PMCID: PMC528246 Biochemistry A COMPARISON OF THE HYDROGENASE ACTIVITIES OF DIFFERENT MICROÖRGANISMS PMCID: PMC528247 Genetics GROWTH RESPONSE OF SINGLE-GENE DWARF MUTANTS IN MAIZE TO GIBBERELLIC ACID PMCID: PMC528248 THE q LOCUS OF NEUROSPORA CRASSA PMCID: PMC528249 A CASE OF POLYPLOIDY IN DIPTERA PMCID: PMC528250 Mathematics ON COVERING A CIRCLE BY RANDOMLY PLACED ARCS PMCID: PMC528251 COMBINATORIAL PROBLEMS IN THE THEORY OF GRAPHS. II PMCID: PMC528252 ON THE LITTLEWOOD-PALEY FUNCTION g* (θ) PMCID: PMC528253 Psychology THE SENSITIVITY OF THE TURTLE'S EAR AS SHOWN BY ITS ELECTRICAL POTENTIALS PMCID: PMC528254 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||