This journal provides immediate access to some articles. Volume 31(7); July 1945 Bacteriology Strain Specificity and Production of Antibiotic Substances: VI. Strain Variation and Production of Streptothricin by Actinomyces Lavendulae PMCID: PMC1078802 Botany A Contribution to the Cytology of the Australian-South Pacific Species of Nicotiana PMCID: PMC1078794 Mathematics On a Class of Hermitian Transformations Containing Self-Adjoint Differential Operators PMCID: PMC1078795 New Types of Relations in Finite Field Theory (Second Paper) PMCID: PMC1078796 On Algebraic Lie Algebras PMCID: PMC1078797 Two Integral Equations PMCID: PMC1078798 National Academy of Sciences Vital Statistics of the National Academy of Sciences PMCID: PMC1078799 Pathology The Variation of Infectivity: II PMCID: PMC1078801 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||