Includes two papers of which the author contributed the first part only: I. [pt. 1] On the theory of the steam-engine indicator and the errors in indicator diagrams; [pt. 2] Experiments on the steam-engine indicator, by A. W. Brightmore: v. 2, p. [163]-202. II. [pt. 1] On the mechanical equivalent of heat; [pt. 2] On an experimental determination of the mechanical equivalent of the mean specific heat of water between 32 [degrees] and 212 [degrees] F., made in the Whitworth engineering laboratory, Owens college, on Professor Osborne Reynolds' method, by W. H. Moorby: v. 2, p. [601]-733. 6 pl.