Erratum.
The opening sentence of Igor B. Dawid's review (6 Feb., p. 695) of Gene Activity in Early Development by Eric H. Davidson was incorrectly printed. The first paragraph of the review should have read as follows. "As in the two earlier editions of Davidson's standard work, much of this new book is devoted to discussion of quantitative work on RNA accumulation and distribution during development. Davidson also discusses in detail spatial regulation of gene expression in the embryo and its relationship to lineage determination, providing a strongly comparative point of view and generating broad and well-balanced interpretations of large bodies of connected facts. The result is an excellent book that represents the field from a personal yet broadly convincing vantage point."