RT Journal Article SR Electronic T1 CONCERNING SELECTIVE PERMEABILITY JF Science JO Science FD American Association for the Advancement of Science SP 567 OP 569 DO 10.1126/science.47.1223.567 VO 47 IS 1223 A1 Macarthur, C. G. YR 1918 UL http://science.sciencemag.org/content/47/1223/567.abstract AB