The science of geology was constructed in the decades around 1800 from earlier practices that had been significantly different in their cognitive goals. In the studies collected here Martin Rudwick traces how it came to be recognised as a new kind of natural science, because it was constituted around the idea that the natural world had its own history. The earth had to be understood not only in relation to unchanging natural laws that could be observed in action in the present, but also in terms of a pre-human past that could be reliably known, even if not directly observable and its traces...