This journal provides immediate access to some articles. Volume 22(5); May 1936 Astronomy A Second Law of the Motions of Eruptive Prominences PMCID: PMC1076754 Botany The Effect of Auxin on the Abscission of Petioles PMCID: PMC1076755 Geology and Paleontology Perissodactyla of the Sespe Eocene, California PMCID: PMC1076756 Mathematics Groups in Which the Squares of the Operators Generate a Cyclic Group PMCID: PMC1076762 Mathematical Postulates for the Logical Operations of Assertion, Conjunction, Negation and Equality PMCID: PMC1076763 Isometries of 2-Dimensional Riemannian Manifolds into Themselves PMCID: PMC1076764 On the Connectivity Ring of a Bicompact Space PMCID: PMC1076765 Conformal Geometry of Horn Angles PMCID: PMC1076766 On Normal Coördinates PMCID: PMC1076767 Functional Topology and Abstract Variational Theory PMCID: PMC1076768 A Theory of Classes Presupposing no Canons of Type PMCID: PMC1076769 Physics and Engineering Extraterrestrial Effects of Cosmic Rays PMCID: PMC1076757 Physiology and Biochemistry The Effect of Temperature on the Respiration of the Earthworm PMCID: PMC1076758 The Change in the Response of Avena-Coleoptiles to Growth Regulations Produced by Aging PMCID: PMC1076759 Zoölogy and Anatomy The Sexual and Reproductive Cycles of Chimpanzee PMCID: PMC1076760 The Nearctic Dirhinini and Epitranini PMCID: PMC1076761 Journal Matter Administrative content — journal masthead, notices, indexes, etc. | ||