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Laws and natural philosophy

2024, The History and Philosophy of Science, 1450 - 1750

For the period surveyed in this volume, the last century stands out in virtue of a twin innovation. One is the thought that physical objects are subject to laws. Laws govern material bodies too, not just mankind and society. The other is that the science of nature must be built on them; it should have laws at its foundation. This joint development is of enduring interest, because it was a radical departure from what came before, and it remains a distinguishing mark of science as we know it. This chapter analyzes that twin innovation in its historical context. I begin with two major attempts to explicate the notion of a law of nature then (sec. I). Next, I examine a popular idea at the time, viz. that laws of nature are about causes (sec. II). Then I end with a closer look at the sort of sentences that were called laws in that century (sec. III). As with the other chapters in this volume, the intent is pedagogical: to offer college teachers a helpful survey of an idea central to early modern science. Current philosophy of science is home to sustained debates about what it is to be a law of nature. These debates rest on a shared intuition and two framing assumptions. The intuition is that there is a real difference between sentences like these: 1. All masses exert gravity on other masses. 2. All the coins in my pocket are dimes. The assumptions are: a law of nature is a universal generalization ('All Xs are Ys'); and any candidate account of lawhood must vindicate the intuition above -it must entail that (1) counts as a law of nature but (2) does not. ! 1