Book Reviews Relaxation Methods. D. N. de G. Allen. McGraw-Hill, New York-London, 1954. ix + 257 pp. Illus. $7.50 + See all authors and affiliations Science 10 Sep 1954:Vol. 120, Issue 3115, pp. 423-424DOI: 10.1126/science.120.3115.423-a CARL H. WALTHERFind this author on Google Scholar Find this author on PubMed Search for this author on this site Article Info & Metrics eLetters PDF This is a PDF-only article. The first page of the PDF of this article appears below.