Boyle Publishes The Sceptical Chymist

Robert Boyle published The Sceptical Chymist in London in 1661, presenting a corpuscular theory of matter and proposing that chemical elements be defined as substances that cannot be broken down into simpler components. The work systematically rejected Aristotle's four-element framework and Paracelsus's three-principle theory, argued for reproducible experimental evidence as the basis of chemical knowledge, and established a definition of the element that prefigured modern chemistry. Its publication is widely regarded as a foundational transition from speculative alchemy to experimental chemistry.