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DIARY OF SOCIETIES. 
THURSDAY, Apri 23. 
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FRIDAY, Aprit 24. 
ROvAE INSTITUTION, at 9.—The Stars around the North Pole: Dr. F. W. 
yson. 
Junior INsTITUTION OF ENGINEERS, at 8.—A Visit to the Iron Districts 
of French Alsace: G. Evetts. 
InsTITUTION OF MEcHaAN)cal. ENGINEERS, at 8.—Application of Electrical 
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SATURDAY, Apriv 25. 
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MONDAY, Aprit 27. 
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NO}/232'1, VO, 3) 
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NATURE 
[APRIL 23, 1914 
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FuGenics EpucaTion Society, at 8.30.—Le Mesure de I'Intelligence: 
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: WEDNESDAY, APRIL 29. 
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Economic and Industrial Resources: C. R. Enock. 
GEoLocicaL Society, at 8.—On the Lower Jaw of an Anthropoid Ape 
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THURSDAY, APRIL 30. 
Royat Society, at 4.30.—Probable Papers: The lack of Adaptation in the 
Tristichaceae and Podostemaceae: Dr. J. C. Willis.—The Genetics of 
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Roya INSTITUTION, at 3-—The Last Chapter of Greek Philosophy: 
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SATURDAY, May 2. 
RoyaL INSTITUTION, at 3.—Similarity of Motion in Fluids. (2) The 
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BritisH PsycHoLoGcicaL SociETy.—The Psychology of Play with special 
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—Corresponding points: Prof. C. Spearman.—An attempt at an exact 
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CONTENTS. PAGE 
By AC GEO 183 
A Treatise on Igneous Rocks. ey ee 
By G. B. M.. 183 
Mathematics for French Freshmen. 
Analytical and Synthetical Chemistry. By G.T.M. 184 
Textiles. By Wm. Scott Taggart... oa tes pare 
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The Earth’s Contraction.—Dr. John Ball .... 188 
Zoological Classification. —Dr. F. A. Bather, F.R.S. 189 
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An Optical Illusion.—J. W. Giltay 2 . 189 
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