498 



NATURE 



[July io, 1913 



Canada. Department of Mines. Mines Branch. 

 The Magnetic Iron Sands of Natashkwan, County 

 of Sagvenay, Province of Quebec. By G. C. Mac- 

 kenzie. Pp. vi + 57 + xxii plates + maps. (Ottawa: 

 Government Printing Bureau.) 



Annual Report on the Mineral Production of 

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Meteorological Observations made at the Royal Ob- 

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Bulletin of the Territory of Papua. No. 1, Notes 

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 (Sydney : W. A. Gullick.) 



Resuscitation from Electric Shock, Traumatic 

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 (Schaefer) Method. By Dr. C. A. Lauffer. Pp. v + 

 47. (New York: J. Wiley and Sons; London: Chap- 

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Researches in Physical Optics, with especial Refer- 

 ence to the Radiation of Electrons. By Prof. R. W. 

 Wood. Parti. Pp. vii-t- 1344- 10 plates. (New York : 

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Graphical Methods. A Course of Lectures delivered 

 in Columbia University, New York, October, 1909, 

 to January, iqio. By Prof. C. Runge. Pp. vii4-i48. 

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Cooperation in Agriculture. Bv G. H. Powell. 

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The Farmer of To-morrow. By F. I. Anderson. 

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Practical Stone Quarrying. By A. Greenwell and 

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Ueber die neuen Bestrebungen, das Los der Krebs- 

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Entwurf einer verallgemeinerten Relativitatstheorie 

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Didaktik der Himmelskunde und der astronomischen 

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Trigonometry. Complete Tables. By Profs. A. M. 

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Trigonometry. Brief Tables. By Profs. A. M. 

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The Seine from Havre to Paris. By Sir E. Thorpe. 

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Mitteilungen aus den deutschen Schutzgebieten. 

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NO. 2280, VOL. 91] 



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Report on the Danish Oceanographical Expeditions, 

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Studies on the Influence of Thermal Environment 

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Abwehrfermente des tierischen Organismus gegen 

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CONTENTS. page 



Atoms and Molecules 473 



The Cult of the Thunderstone 473 



Pure and Applied Chemistry 474 



Our Bookshelf 475 



Letters to the Editor: — 



Radio-activity and the Age of the Earth. — Dr. L. L. 



Fermor 476 



Pianoforte Touch.— Prof. W. B. Morton 477 



The Reflection of X-Rays by Crystals.— Prof. W. H. 



Bragg, F.R.S 477 



Wireless Antennre. — A. A. Campbell Swinton . 477 

 A Mechanical Vacuum-Tube Regulator. — Dr. G. W. C. 



Kaye ; Richard Whiddington 478 



The Humphrey Owen ]ones Memorial Fund. — Prof. 



W. J. Pope, F.R.s 47S 



• Smithsonian Physical Tables— Dr. C. D. Walcott . 47S 



Modern Views of Electro-therapeutics. By H. L. J. 478 



International Fishery Investigations 4S0 



American Universities and Colleges. By Prof. J. A. 



Green 4S1 



Notes . . : 4S2 



Our Astronomical Column : — 



The Hottest Stars 4S7 



A Photo-visual Comparator for the Identification of 



Minor Planets .... 4S7 



Meteor Dust as a Measure of Geologic Time .... 487 



The Royal Agricultural Show. By J. R. A.-D. 4S7 



Bedford College for Women 488 



Russian Geographical Papers 48S 



Meteorological Reports and Summaries 489 



Great Advance in Crystallography. (Illustrated.) By 



Dr. A. E. H. Tutton, F.R.S 490 



University and Educational Intelligence 494 



Societies and Academies 495 



Books Received 497 



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