Describes Smith's laws of Nature, including his debt to Stoic logic and its reliance on essences. It considers Smith's response to David Hume's scepticism, differentiates Smith's methodology from positivism, and traces the evolution of the idea that Smith's theory was scientific. Keywords:essences,
David Hume,
laws of Nature,
methodology,
Isaac Newton,
positivism,
scepticism,
stoic logic