This journal provides immediate access to some articles. Volume 4(11); November 1918 Mathematics On Certain Projective Generalizations of Metric Theorems, and the Curves of Darboux and Segre PMCID: PMC1091490 Physics The Interferometry of Vibrating Systems PMCID: PMC1091486 On the Essence of Physical Relativity PMCID: PMC1091487 Gravitational Attraction in Connection with the Rectangular Interferometer PMCID: PMC1091488 The General Character of Specific Heats at High Temperatures PMCID: PMC1091489 The Rectangular Interferometer with Achromatic Displacement Fringes in Connection with the Horizontal Pendulum PMCID: PMC1091491 Zoology The `Homing Habits' of the Pulmonate Mollusk Onchidium PMCID: PMC1091483 Growth and Duration of Life of Chiton Tuberculatus PMCID: PMC1091484 Growth of Chiton Tuberculatus in Different Environments PMCID: PMC1091485 Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||