The purposes of this paper are: (1) to present four theories of the nature of natural laws, (2) to show that only one of them is capable of adequately answering to Tooley’s Cases, and (3) indicate why these cases are relevant for our ontology. These purposes are important since the concept of “natural law” is used in many (if not all) realms of natural science and in many branches of philosophy; if Tooley’s cases are possible, they represent situations that must (...) be adequately described. If there is only one theory that can adequately describe such cases, there are strong reasons to prefer this theory over the other ones. (shrink)