1811 in science

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The year 1811 in science and technology involved some significant events, listed below.

Astronomy

Johann Karl Wilhelm Illiger publishes Prodromus systematis mammalium et avium, an updating of Linnean taxonomy and a major influence on the concept of the 'Family' in biology. He first defines the infraclass Marsupialia.
Peter Simon Pallas begins publication of Zoographia rosso-Asiatica, sistens omnium animalium in extenso Imperio rossico, et adjacentibus maribus observatorum recensionem, domicilia, mores et descriptiones, anatomen atque icones plurimorum in Saint Petersburg.

Charles Bell publishes An Idea of a New Anatomy of the Brain,^[3] starting to distinguish between sensory and motor nerves.
Abraham Colles publishes A Treatise on Surgical Anatomy in Dublin.
Francis Place publishes Illustrations and Proofs of the Principles of Population, including an examination of the proposed remedies of Mr. Malthus, and a reply to the objections of Mr. Godwin and others in London, the first significant text in English to advocate contraception.^[4]

Amedeo Avogadro proposes his hypothesis relating volumes and numbers of molecules of gases.