Abstract

Charles Lyell’s Principles of Geology is widely regarded as one of the great works of 19th century science, and one of the most influential works in the entire history of the earth sciences. Yet the standard critical interpretation of the Principles makes such high regard and influence look puzzling at best. We are told, for instance, that Lyell’s argument rests on a contentious a priori methodological distinction between scientific and non-scientific explanations, the former featuring observed causes at their present intensities, the latter featuring anything else. 2 We are also told that Lyell simply assumes a priori that.