The central star of the Ring Nebula is discovered by Friedrich von Hahn: the central star is a white dwarf star with a temperature of between 100,000 and 120,000 K.
Antoine François, comte de Fourcroy, begins publication in Paris of the comprehensive chemistry textbook Système des connaissances chimiques et de leurs applications aux phénomènes de la nature et de l'art.
September – Philippe Pinel publishes Traité médico-philosophique sur l'aliénation mentale ou la manie (Medical and philosophical Treatise on insanity or mania) which marks the beginning of an in-depth change in the approaches and methods of work with "lunatics".[5]
Xavier Bichat publishes Traité sur les membranes and Recherches physiologiques sur la vie et la mort, pioneering texts in histology and pathology.[6]
^Elaut, L. (July 1969). "The theory of membranes of F. X. Bichat and his predecessors". Sudhoffs Archiv. 53 (1). West Germany: 68–76. ISSN0039-4564. PMID4241888.
^Taquet, P.; Padian, K. (2004). "The earliest known restoration of a pterosaur and the philosophical origins of Cuvier's Ossemens Fossiles". Comptes Rendus Palevol. 3 (2): 157–175. doi:10.1016/j.crpv.2004.02.002.