Book Reviews Gene Activity in Early Development. Eric H. Davidson. Academic Press, New York, 1969. xii + 376 pp., illus. $12.50 + See all authors and affiliations Science 28 Nov 1969:Vol. 166, Issue 3909, pp. 1134DOI: 10.1126/science.166.3909.1134 Ralph T. HinegardnerFind 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.