This journal provides immediate access to some articles. Volume 11(11); November 1925 Astronomy A Test of Electromagnetic Theory of the Hydrogen Vortices Surrounding Sun-Spots PMCID: PMC1086214 Biology Recent Evolution in Milk Secretion of Guernsey Cattle PMCID: PMC1086215 Engineering General Criterion for the Circular Locus of the Current Vector in A. C. Circuits and Machinery PMCID: PMC1086211 Genetics Elimination of Chromosomes Due to a Mutant (Minute-N) in Drosophila Melanogaster PMCID: PMC1086216 Haploidy in Drosophila Melanogaster PMCID: PMC1086217 Mathematics Postulates for Reversible Order on a Closed Line (Separation of Point-Pairs) PMCID: PMC1086212 Paleontology The Age and Affinities of the Tertiary Flora of Western Canada PMCID: PMC1086208 Physics The Metastable 2p3-State of Mercury Atoms PMCID: PMC1086209 Some Experiments on Collisions of the Second Kind PMCID: PMC1086210 Physiology Plant Growth PMCID: PMC1086218 Psychology The Hypothesis of Inhibition by Drainage PMCID: PMC1086213 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||