Unpublished paper, 'The force function in crystals' by Alfred Einhorn The first part of the paper concerns the consideration of the Tesseral, Tetragonal, and Rhombic systems. By means of Einhorn's assumption in regard to the stress-distribution in crystals of the above systems, the equilibrium conditions are deduced which further involve that the boundary of the configuration must either be plane or spherical. The paper is split into three chapters: 'Foundation of the assumption', 'Derivation of the force function' and 'Determination of the boundary'. Marked on front as 'Archives Feb 19/85'. Subject: Chemistry Received 27 November 1884. Read 8 January 1885. Communicated by G [George] Matthey. Written by Einhorn in London. Whilst the Royal Society declined to publish this paper in full, an abstract of the paper was published in volume 38 of the Proceedings of the Royal Society as 'The force function in crystals'. 10 November 1884