Association Affairs Association Affairs + See all authors and affiliations Science 26 Aug 1949:Vol. 110, Issue 2852, pp. 220DOI: 10.1126/science.110.2852.220 Article Info & Metrics eLetters PDF This article has a correction. Please see:Correction - September 02, 1949 This is a PDF-only article. The first page of the PDF of this article appears below.