TECHNOLOGY AND CULTURE Book Reviews 153 This is hardly what we expect in books on culture, but it becomes less surprising when one finds that the book is dedicated to Joseph Need ham, and when Dieter Kuhn indicates that he is a contributor to the Science and Civilisation in China volume dealing with textiles. The technical advances of the Sung, as described here, include improved strains of rice, fertilization, and the introduction of exotic citrus fruits, teas, sugar, and cotton. The seed plow came into wide spread use, as did a kind of reaping machine. Watermills were sys tematically established by the state, and there is an illustration of a waterpowered spinning machine of 1313. The book is handier than, and to some degree supplementary to, the Needham magnum opus in its treatment of technology, especially ofagriculture and textiles. And technology occupies only about a third of the text, the bulk of the remainder being devoted to relevant topics, the development of a civilian society, trade and daily life (the standard of living appears to have resembled that of Italian cities two centuries later), and archaeological evidence. Kuhn’s sources are mainly Chinese, and there is a Chinese index. R. P. Multhauf Dr. Multhauf is historian emeritus at the National Museum of American History, Smithsonian Institution. Harvesting the Air: Windmill Pioneers in Twelfth-Century England. By Edward J. Kealey. Berkeley and Los Angeles: University of Cali fornia Press, 1987. Pp. xiii + 307; illustrations, notes, appendix, bib liography, index. $40.00. The origins of wind power may be less problematic than the origins of waterpower, but even so they have given rise to much controversy over the years. J. C. Notebaart’s classic study, Windmuehlen (The Hague and Paris: Mouton, 1971), examines various theories exhaustively, and it might be supposed definitively, yet it still leaves room for debate. Its absence from the bibliography of Harvesting the Air is a curious omission. So much depends on the exact dating of information from legal documents that may or may not be faithful copies of earlier versions. Certainly Edward Kealey makes a good case for localizing the in vention of vertical windmills of the oldest, post-mill type in eastern England somewhat earlier than the period usually specified. For whereas Notebaart and others indicate such mills in England only from the 1190s, and in Normandy from the 1180s (a matter of one or two instances in each case), Kealey’s first windmill reference dates from before 1137, and he can find a few more from the middle years of the 12th century. Windmills spread slowly at first, he states, until inflation and other changes in the last twenty years of the century finally made them popular. Kealey relied chiefly on monastic sources, 154 Book Reviews TECHNOLOGY AND CULTURE but he also incorporated the results of recent archaeological investi gation, and he uses manuscript illustration (the earliest also English). Until monastic records or archaeological data from the Continent can challenge him, Kealey’s thesis stands. He provides us with a table of no less than fifty-six English windmills that date from before 1200, together with a map of their distribution and a gazetteer that supplies details of the history of each mill. It would have been useful to have a graph showing the increasing proportion of English parishes that had windmills; did this increase over time, as Kealey seems to suggest? Unfortunately, most of his dates are those by which a certain mill stood on a particular site. They are not erection dates, which can seldom be discovered. Windmills are a striking piece of invention. The going work might be adapted from the machinery of watermills, but when before had a shed been mounted on a post so as to rotate? Buildings—and wa termills too—were constructed in order to be stable, but here was one that was intended to turn around. Like watermills, windmills are re stricted in the potential sites they can occupy; they must stand in the open where neither ridges nor other obstacles will break the wind before it strikes their sails. Millstones are quite heavy, so installation of the machinery must have been a hard job; at least...