After the reading was concluded, Mr. E. A. Cowper took the floor, and stated that I was entirely mistaken in my explanation of this action, that this had been investigated by a gentleman whose name he gave but which I have forgotten, and who had demonstrated that this retarding and accelerating action was represented by a curve, which approximately he drew on the blackboard, but which he excused himself from demonstrating there, as it would require the use of the calculus and would take considerable time. For this reason the discussion was postponed. At the next meeting Mr. Cowper did not present this demonstration, and long afterwards he wrote a letter to the editors of _Engineering_, stating that on full investigation he had found the retardation and acceleration of the piston to be represented by triangles and not by a curve. At the discussion of the paper my view was supported by all the speakers who addressed themselves to this point, except Mr. Cowper. An especially careful and valuable exposition of the action of the reciprocating parts was given Mr. Edwin Reynolds, then of the Don Steel Works, Sheffield. Zerah Colburn, the editor of _Engineering_, had always taken a warm interest in my engine, and in the winter following the Paris Exposition he invited me to furnish him the drawings and material for its description in his paper. This I did, and from these he prepared a series of articles written in his usual clear and trenchant style. These will be found in Volume V of _Engineering_, the cuts following page 92, and the articles on pages 119, 143, 158, 184, and 200. Mr. Colburn’s articles in _Engineering_ are so interesting in themselves that I think I need make no apology for quoting from them his remarks on this subject of the inertia of the reciprocating parts, and those in which is depicted the revolutionary nature of the high-speed engine, as viewed at that time. After a prelude, with most of which the reader is already acquainted, Mr. Colburn says: “When a steam-engine is brought from abroad to the very spot where the steam-engine originated, and where it has received, so far at least as numbers are concerned, its greatest development, and is claimed to be superior to those produced here, and to be able to run advantageously at a speed hitherto deemed impracticable, its promoters must not expect to have much attention paid to its claims until such attention has been actually compelled, and then they must be prepared for an ordeal of severest criticism....