This journal provides immediate access to some articles. Volume 15(12); December 15, 1929 Biology NEW RESULTS FROM THE STUDY OF COELENTERATE NEMATOCYSTS: (Preliminary Note) PMCID: PMC522582 Botany A PROPOSED PHYLOGENY OF THE ONAGRACEAE BASED PRIMARILY ON NUMBER OF CHROMOSOMES PMCID: PMC522580 THE CHROMOSOMES OF BUGINVILLAEA PMCID: PMC522581 Genetics UNISEXUAL PROGENIES AND THE SEX CHROMOSOME MECHANISM IN SCIARA PMCID: PMC522576 FURTHER STUDIES ON THE CHROMOSOME MECHANISM RESPONSIBLE FOR UNISEXUAL PROGENIES IN SCIARA. TESTS OF EXCEPTIONAL MALES PMCID: PMC522577 CHANGES IN THE RATE OF MUTABILITY OF THE MUTABLE MINIATURE GENE OF DROSOPHILA VIRILIS PMCID: PMC522578 CHROMOSOME NUMBER AND THE MUTATION RATE IN AVENA AND TRITICUM PMCID: PMC522579 Mathematics ON GROUPS DEFINED BY Aq = 1, B-1 AB = Ax, BQ = Ae PMCID: PMC522585 ON THE EXISTENCE OF INTEGRALS OF EINSTEIN'S GRAVITATIONAL EQUATIONS FOR FREE SPACE AND THEIR EXTENSION TO n VARIABLES PMCID: PMC522586 Physics AN INTERFEROMETER METHOD OF OBSERVING THE VIBRATIONS OF AN OSCILLATING QUARTZ PLATE PMCID: PMC522583 PERTURBATIONS IN BAND SPECTRA. II PMCID: PMC522584 Journal Matter Administrative content — journal masthead, notices, indexes, etc. | ||