TECHNOLOGY AND CULTURE Book Reviews 679 past who, without benefit of higher mathematics or computers or stress tests, nevertheless managed to solve some extraordinarily dif ficult problems, like how to erect a building of stone with largely glass walls, how to transfer the thrust of arches to buttresses, how to raise the huge blocks to construct the great pyramids. The book is to be recommended to all those wishing to grasp something of the sweep of building problems. Marjorie Nice Boyer Dr. Boyer is professor emerita of history, York College, City University of New York. She has published numerous articles on medieval French travel and a book, Medieval French Bridges: A History (Cambridge, Mass.: Medieval Academy of America, 1976). She is currently writing a book on medieval vehicles. Irrigation in the Bajío Region of Colonial Mexico. By Michael E. Murphy. Boulder, Colo.: Westview Press, 1986. Pp. xii + 226; illustrations, notes, glossary, appendix, bibliography, index. $19.95 (paper). Michael Murphy brings a vast legal expertise, sophisticated geo graphic knowledge, skill and industry in archival research, and a firm grasp of the history of technology to this rich study of irrigation systems in four urban centers of the colonial Mexican Bajío region. The maps that accompany the text’s description of colonial water works and the detailed drawings of hydraulic technology and instru ments add yet another valuable dimension to this multifaceted book. Murphy interprets historical and legal data in the light of ecological and economic conditions to reconstruct the evolution of waterworks in each center. He examines their technology, the social formations they gave rise to, the political and juridical institutions they fostered, and the specialists they required. The book begins by raising the same questions Wittfogel addressed in Oriental Despotism: What are the linkages among the natural envi ronment, the presence and kinds of hydraulic systems found, cen tralized political administration, division of labor, and despotic rule? However, unlike the scholars who have attempted to test Wittfogel’s hypotheses by oversimplifying them, Murphy seeks answers to these questions in an immense corpus ofcarefully read and digested archival material, dating from the 16th to the 19th century, and in the ar chaeological remains of waterworks. The Bajío region was a semiarid, frontier society, which supplied the mines of Guanajuato with meat, hides, agricultural produce, and textiles. Querétaro, one of the urban centers, as a conduit to the Chichimec silver mines, became one of the largest colonial industrial cities in the world. Rural and urban population growth in the region gradually encouraged the development of irrigation systems and re liable urban water supplies. 680 Book Reviews TECHNOLOGY AND CULTURE Although the crown controlled natural waterways in the colonies, the legal status of man-made irrigation systems remained ambiguous, and therefore water rights and easements were subject to continuous dispute. These conflicts over the construction of waterworks and the equitable allocation of water were played out in complex and varied fashion among private landholders, Indian pueblos, a burgeoning textile industry, and church orders and sodalities. Murphy shows that pragmatic accommodations were frequently reached without formal interference from central government authorities. Although legal ten ets could be and often were referred to in court proceedings, custom ary precedence more frequently determined resolutions to problems of water rights, and an active market in their sale and purchase soon developed. Murphy’s knowledge of European medieval and Enlightenment legal codes permits him to grasp the kinds of arguments different actors marshaled to defend their water rights, ranging from the prin ciples of use over “time immemorial” to “a year and a day” to “ten years” to the ironic decision that customary water rights of Indian groups (who had been resettled) took precedence over later water rights and usage. His findings also suggest that investments for build ing new waterworks mostly came from a few wealthy landowners in cooperation with one another, from a single church order, or even from a single individual, rather than from central state revenues. He finds at an early date that the polluting and heavy water-using urban textile industry at Querétaro was pressured by urban inhabitants to pay for building their potable water supply. Murphy is...