. Discovery. Science. 196 DISCOVERY / Principt della Meccanica alia luce della Critica. By Giuseppe Casazza. (Societa Editrice Dante Alighieri di Albreghi, Segats & C, I-. ) The Physiography of the McMurdo Sound and Granite Harbour Region. By Griffith Taylor, , , etc., C. S. Wright, , , and R. E. Priestley, British (Terra Nova) Antarctic Expedition of 1910-13. (Harrison & Sons, Ltd.) The Natural History of Wichen Fen. Part I. Edited by Prof. J. Stanley Gardiner, , and A. G. Tansley, (Bowes & Bowes, 35. 6d.) Scientific Method. By A. D. Ri
. Discovery. Science. 196 DISCOVERY / Principt della Meccanica alia luce della Critica. By Giuseppe Casazza. (Societa Editrice Dante Alighieri di Albreghi, Segats & C, I-. ) The Physiography of the McMurdo Sound and Granite Harbour Region. By Griffith Taylor, , , etc., C. S. Wright, , , and R. E. Priestley, British (Terra Nova) Antarctic Expedition of 1910-13. (Harrison & Sons, Ltd.) The Natural History of Wichen Fen. Part I. Edited by Prof. J. Stanley Gardiner, , and A. G. Tansley, (Bowes & Bowes, 35. 6d.) Scientific Method. By A. D. Ritchie. (Kegan Paul, bs.) The Phase Rule. By A. C. D. Rivett. (Oxford I'ni- versit}' Press, los. 61^.) Dreams of an Astronomer. By Camille Flammarion, Translated from the French by E. E. Fournier d'Albe. (T. Fisher Unwin, los. 6d.) Petrology for Students : An Introduction to the Study of Rocks under the Microscope. By Alfred Harker, , , , Sixth edition, revised. (Cambridge University Press, 85. 6rf.) The Properties of Engineering Materials. By W. C. Popplewell and H. Carrington. (Methuen, 28s.) Six Great Scientists. By Margaret Avery'. (Methuen, 25. 6d.) Correspondence AXIAL ROTATION To the Editor of Discovery Dear Sir, I was much interested in Mr. J. Marshall's letter upon Axial Rotation in the May Discovery ; it is a difficulty which I have often met with in others during my many years' experience of teaching astronomical science. In the first place Mr. Marshall has not got hold of the idea of the laws that govern lunar rotation, because he states that it seems to him that the moon must turn the same face to the earth if its period be what it is, or 28,000,000 years. The moon-earth system is one that is bound together by tidal attraction, and this same force is tending to drive the moon farther and farther from the earth, which state of affairs is gradually slowing down the earth, but at the same time is speeding up the moon. The day will therefore come i
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