Book Reviews Conference on Problems of Aging. Transactions of the Twelfth Conference, February 6-7, 1950, New York. Nathan W. Shock, Ed. New York: Josiah Macy, Jr. Foundation, 1951. 215 pp. $3.50 + See all authors and affiliations Science 10 Aug 1951:Vol. 114, Issue 2954, pp. 164DOI: 10.1126/science.114.2954.164-b C. M. MCCAYFind 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.