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Indian Population Decline: The Missions of Northwestern New Spain, 1687-1840. By Robert H. Jackson. (Albuquerque: University of New Mexico Press, 1994. Pp. xii, 229. Maps. Graphs. Tables. Appendices. Notes. Bibliography. Index. $29.95.)

The author's interest in the issue of the decline of the native American population of the Sonora, Baja and Alta California missions has extended over a decade and has resulted in more than a dozen scholarly papers in various national and international academic journals. Here, in four tightly argued chapters Jackson presents an overview of the evolution of the mission system, the nature and regional variation in demographic collapse, the causes for depopulation, and the northwestern New Spain phenomenon compared with other places (including Alto Peru, France, England and the Philippines).