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This journal provides immediate access to some articles. Volume 8(7); July 1922 Astronomy Invisible Sun-Spots PMCID: PMC1085084 Comparison of Theory with Observation for the Minor Planets 10 Hygiea and 175 Andromache with Respect to Perturbations by Jupiter PMCID: PMC1085085 A Method of Deriving the Distance of the A-Type Stars PMCID: PMC1085086 The Larger Results of 20 Years of Solar Radiation Observations PMCID: PMC1085087 Biology On the Influence of Density of Population Upon the Rate of Reproduction in Drosophila PMCID: PMC1085096 Animal Evolution PMCID: PMC1085097 The Correlation of Time Units and Climatic Changes in Peat Deposits of the United States and Europe PMCID: PMC1085098 Chemistry The Isolation of Pyrimidines from the Nucleic Acid of Tubercle Bacillus PMCID: PMC1085090 Mathematics Normal Coördinates for the Geometry of Paths PMCID: PMC1085092 Principal Directions in a Riemannian Space PMCID: PMC1085093 Principal Directions in the Einstein Solar Field PMCID: PMC1085094 Fields of Parallel Vectors in the Geometry of Paths PMCID: PMC1085095 Pathology Replantation of Entire Limbs without Suture of Vessels PMCID: PMC1085088 Physics The Physical Examination of Hearing and Binaural Aids for the Deaf PMCID: PMC1085080 The Production of an E. M. F. on Closed Circuit by a Light Effect on Argentite PMCID: PMC1085081 Positive and Negative Pinhole Resonators PMCID: PMC1085082 The Evaluation of Quantum Integrals PMCID: PMC1085083 The Spectral Energy Distribution and Opacity of Wire Explosion Vapors PMCID: PMC1085099 Psychology The Relative Sensitivity of the Ear at Different Levels of Loudness PMCID: PMC1085091 Zoölogy Degeneration and Regeneration of the Lateral-line Organs in Amiurus Nebulosus PMCID: PMC1085089 Correction Note on the Definition of a Lineal Functional PMCID: PMC1085100 Corrects: Note on the Definition of a Lineal Functional. Proc Natl Acad Sci U S A. 1922 February; 8(2): 26–29. Erratum On the Distribution of the Velocities of Stars of Late Types of Spectrum PMCID: PMC1085101 Corrects: On the Distribution of the Velocities of Stars of Late Types of Spectrum. Proc Natl Acad Sci U S A. 1922 June; 8(6): 141–146. Journal Matter Original table of contents page Administrative content — journal masthead, notices, indexes, etc. | ||