. Discovery. Science. 252 DISCOVERY SCIENCE AND MEDICINE Textile Chemistry : An Introduction to the Chemistry of the Cotton Industry. By F. J. Cooper. (Methuen & Ltd., los. 6d.} Atomic Structure and Spectral Lines. By Arnold Som- MERFIELD. Translated by Henry L. Brose. (Methuen & Co., Ltd., 325.) Studies in Fossil Botany. Part II. Third edition. By DuKiNFiELD Henry Scott, , , , , , , (Adam & Charles Black, 215.) Practical Plant Ecology. A Guide for Beginners in Field Study of Plant Communities. By A. G. Tansley, , (George Alle
. Discovery. Science. 252 DISCOVERY SCIENCE AND MEDICINE Textile Chemistry : An Introduction to the Chemistry of the Cotton Industry. By F. J. Cooper. (Methuen & Ltd., los. 6d.} Atomic Structure and Spectral Lines. By Arnold Som- MERFIELD. Translated by Henry L. Brose. (Methuen & Co., Ltd., 325.) Studies in Fossil Botany. Part II. Third edition. By DuKiNFiELD Henry Scott, , , , , , , (Adam & Charles Black, 215.) Practical Plant Ecology. A Guide for Beginners in Field Study of Plant Communities. By A. G. Tansley, , (George Allen & Unwin, Ltd., 7s. 6rf.) Elementary Zoology. By Oswald H. Latter. (Methuen & Co., Ltd., I2S.) Plant and Flower Forms. By Esther J. G. Kirkwood. (Sidgwick & Jackson). Relativity and Modern Physics. By George David BiRKHOFF, (Harvard University Press; Hum- phrey Milford, Oxford University Press.) Vector Analysis. By C. Runge. Translated by H. Levy. (Methuen & Co., Ltd., gs.) Foundations of Biology. By Professor Lorande Loss Woodruff. (Macmillan, 165.) Chance and Error. By Marsh Hopkins, , , (Kegan Paul, 7s. bd.) The Antiquity of Disease. By Roy L. Moodie. (Univer- sity of Chicago Press, ) Elementary Hygiene. By Bihara Lal Bih.\tra and Prem Nath Suri. (Longmans, Green &. Co., zs. 6d.) Correspondence the crater " Flammarion," 235,000 miles from the earth's surface. The moon is 2,000 miles in diameter, so that the J h Sir, AXIAL ROTATION To the Editor of Discovery Please be good enough to allow me space to reply to Mr. Sillem's letter in your July issue in which be is attempting to help me in my perplexity concerning the moon's movements. I regret to inform him that I am not yet " out of the ; I was staggered when he told me that the disk on the second's hand of my watch, the ball on the string, the orange near the circumference of the turntable, were each turning upon their own axes. He has not, however,
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