 Hobbes was very much interested in scientific explanation of the world: both its practice (which he saw himself as engaged in) and also its theory. Chapter 9 of Leviathan tells us something about the differences between scientific and historical knowledge, and the divisions between sciences. Chapter 6 of De Corpore gives a much fuller treatment of issues in the philosophy of science, issues of what Hobbes calls method. Method tells us how to investigate things in order to achieve scientia, the best sort of knowledge.