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This journal provides immediate access to some articles. Volume 5(6); June 1919 Botany Some Orienting Effects of Monochromatic Lights of Equal Intensities on Fucus Spores and Rhizoids PMCID: PMC1091571 Mathematics On the Most General Class L of Fréchet in which the Heine-Borel-Lebesgue Theorem Holds True PMCID: PMC1091572 On a Certain Class of Rational Ruled Surfaces PMCID: PMC1091575 Physics The Thermo-Electric Equation P = TdV/dT Once More PMCID: PMC1091569 On the X-Ray Absorption Wave-Lengths of Lead Isotopes PMCID: PMC1091570 An Electrodynamometer Using the Vibration Telescope PMCID: PMC1091573 Physiology The Temperature of the Human Skin PMCID: PMC1091574 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||