Knowledge and error : sketches on the psychology of enquiry / Ernst Mach ; with an introd. by Erwin N. Hiebert ; [translation from the German by Thomas J. McCormack and Paul Foulkes ; editor, Brian McGuinness]Principles of the theory of heat : historically and critically elucidated / Ernst Mach ; with an introd. by Martin J. Klein ; ed. by Brian McGuinness ; [this transl. from the 2nd ed., 1900 Mach's Introduction, chapters I-V, XXIV, and XXVIII-XXIX transl. from the German by Thomas J. McCormack ; rev. and completed by P.E.B. Jourdain and A.E. Heath]