Paper, 'The complexity and the dissociation of the molecules of liquids' by William Ramsay Ramsay writes: 'Since the publication of a research on the molecular complexity of liquids by Ramsay and Shields (‘Trans. Chem. Soc.,’vol. 63, p. 1191) two questions have arisen :—First: What other evidence is there as to the existence of complex molecules in certain liquids? Second: How can the amount of dissociation of associating liquids be inferred from measurements of their surface-energy?' Annotations in pencil and ink. Subject: Chemistry Received 26 April 1894 / 1 May 1894. Read 14 June 1894. A version of this paper was published in volume 56 of the Proceedings of the Royal Society as 'The complexity and the dissociation of the molecules of liquids'. 1894