Paper, 'On the effect of temperature upon the refractive index of certain liquids' by W Cassie Cassie writes: 'In my paper “On the Effect of Temperature on the Specific Inductive Capacity of a Dielectric” (‘Phil. Trans.,’ A, 1890), the values obtained for the temperature-variation of specific inductive capacity of four of the liquid dielectrics investigated were compared with the corresponding values of the temperature-variation of refractive index found by Messrs. Dale and Gladstone.' Annotations in pencil and ink. Subject: Optics Received 19 February 1891. Read 12 March 1891. Communicated by Joseph John Thomson. A version of this paper was published in volume 49 of the Proceedings of the Royal Society as 'On the effect of temperature upon the refractive index of certain liquids'. 1891