PROF. CORK'S treatise is essentiaUy, an A advanced theoretical survey. Its scope can best be indicated by paraphrasing certain statements in the author's preface. The pioneer work of Fourier in attacking thermal problems gave solutions from which other branches of the science such as electricity and magnetism were able to profit, and the introduction of the quantum in the theory of radiation was the basis of remarkable advances in many related fields. The presentation of this newer matter together with the older classical treatment widens the scope and range of material of an adequate text surveying the whole scheme. The book aims at covering in a not too detailed manner the complete development of the subject. (1) Heat. By Prof. James M. Cork. Pp. xi + 279. (New York: John Wiley and Sons, Inc.; London: Chapman and Hall, Ltd., 1933.) 18s. 6d. net. (2) A Text Book on Heat. By Dr. A. W. Barton. Pp. xiii + 378. (London, New York and Toronto: Longmans, Green and Co., Ltd., 1933.) 7s. 6d. (3) Heat (Matriculation Standard). By Robert W. Hutchinson. Pp. vii + 266. (London: University Tutorial Press, Ltd., 1933.) 3s. 6d.