This journal provides immediate access to some articles. Volume 36(8); August 1950 Astronomy The Effect of Irregular Absorption on Galaxy Distribution PMCID: PMC1063212 Bacteriology The Mechanism of Action of a Bacterial Toxin on Plant Cells PMCID: PMC1063213 Biochemistry The Growth-Promoting Properties of Quinic Acid PMCID: PMC1063214 Further Studies on the Purine and Pyrimidine Metabolism of Tetrahymena PMCID: PMC1063215 Mathematics Partial Ordering in Theory of Stochastic Processes PMCID: PMC1063216 Cohomology Theory of Abelian Groups and Homotopy Theory I PMCID: PMC1063217 Remarks on the Comparison of Axiom Systems PMCID: PMC1063218 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||