pmc logo imageJournal ListSearchpmc logo image
Logo of pnasPNAS Home page.PNAS Editorial BoardPNAS AboutPNAS SubscriptionsPNAS Info for Authors
This journal provides immediate access to some articles.
Other Issues:  previous | next | latest | archive
Volume 30(3);  March 15, 1944
Astronomy
Galactic and Extragalactic Studies: XVII. Revision of the Distances of Thirty High-Latitude Globular Clusters
Harlow Shapley
Proc Natl Acad Sci U S A. 1944 March 15; 30(3): 61–68.
PMCID: PMC1078670
Botany
Respiratory Rates of the Shoot Tips and Maturing Tissues in Lupinus Albus and Tropaeolum Majus
Ernest Ball and Edgar J. Boell
Proc Natl Acad Sci U S A. 1944 March 15; 30(3): 45–50.
PMCID: PMC1078666
Genetics
Invalidation of the Cytological Evidence for Reciprocal Chiasmata in the Sex Chromosome Bivalent of Male Drosophila
Kenneth W. Cooper
Proc Natl Acad Sci U S A. 1944 March 15; 30(3): 50–54.
PMCID: PMC1078667
Mathematics
Birkhoff's Theory of Gravitation and Einstein's Theory for Weak Fields
Alberto Barajas
Proc Natl Acad Sci U S A. 1944 March 15; 30(3): 54–57.
PMCID: PMC1078668
On the Theory of Characters of Groups and Semi-Groups in Normed Vector Rings
Einar Hille
Proc Natl Acad Sci U S A. 1944 March 15; 30(3): 58–60.
PMCID: PMC1078669
Other Issues:  previous | next | latest | archive
Articles from Proceedings of the National Academy of Sciences of the United States of America are provided here courtesy of
National Academy of Sciences