This article was originally published with the title “ What is the Carnot Cycle? ” in SA Supplements Vol. 66 No. 1710supp (October 1908), p. 239 doi:10.1038 ...

ON p. 326 of NATURE for August 29 appears an abstract of a paper by Dr. J. S. Haldane, which he read before the Institution of Mining Engineers on June 16. In this paper he has “thrown to the ...