 A Treatise on Electricity and Magnetism by James Clerk Maxwell

Volume II, chapter VI, §442, contrasts Siméon Denis Poisson's induced molecular magnetization with Wilhelm Eduard Weber's pre-existing molecular magnets. A publisher transcription of that section is available at www.cambridge.org/core/books/abs/treatise-on-electricity-and-magnetism/webers-theory-of-magnetic-induction/672E4931AABCC94ED48AE9B952B85B48.