'Nature's Government' is a daring attempt to juxtapose the histories of Britain, western science, and imperialism. It shows how colonial expansion, from the age of Alexander the Great to the twentieth century, led to complex kinds of knowledge. Science, and botany in particular, was fed by information culled from the exploration of the globe. At the same time science was useful to imperialism: it guided the exploitation of exotic environments and made conquest seem necessary, legitimate, and beneficial. Drayton traces the history of this idea of 'improvement' from its Christian agrarian...