Unpublished paper, 'On the relation between the electrical resistances of pure metals and their molecular constants' by W Williams Williams aims 'to call attention to certain relations of an extremely simple character which appear to exist between the electrical resistances of pure metals and some of their molecular constants, and to fully discuss the accordance of these relations with known facts in order to prepare the way for further investigations by others.' Annotations in ink throughout. Subject: Chemistry Received 19 March 1901. Read 20 June 1901. Communicated by [Andrew] Gray. 1901