Book Reviews Book Review Index Science 22 Apr 1949:Vol. 109, Issue 2834, pp. 429-430DOI: 10.1126/science.109.2834.429 Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears above.
Science Vol 109, Issue 283422 April 1949 Table of Contents Print Table of Contents Back Matter (PDF) Ed Board (PDF) Front Matter (PDF)