156 



NATURE 



[April 13, 1916 



PP' 59^' (Honolulu : The Hawaiian Gazette Co., 

 Ltd.) 



Memoirs of the Geological Survey. England and 

 Wales. On the Thicknesses of Strata in the Counties 

 of England and Wales, exclusive of Rocks older than 

 the Permian. By Dr. Strahan, and others. Pp. vi + 

 172. The Geology of the South Wales Coalfield. Part 

 xii., The Country around Milford, being an account 

 of the regFon comprised in Sheet 227 of the Map. 

 By T. C. Cantrill, and others. Pp. vii+185. (Lon- 

 don: H.M.S.O. ; E. Stanford, Ltd.) 4s. 6d. and 

 2S. 6d. respectively. 



The Sex Complex. By Dr. W. Blair Bell. Pp. 

 xvii + 233. (London : Bailliere, Tindall, and Cox.) 

 12s. 6d. net. 



Physiological Chemistry. By Prof. A. P. Mathews. 

 Pp. vi+1040. (London: Bailliere, Tindall and Cox.) 

 215. net. 



Brook and River Trouting. By H. H. Edmonds and 

 N. N. Lee. Pp. 106. (Bradford : The authors.) 

 I05. 6d. net. 



On the Relation of Imports to Exports. By J. 

 Taylor Peddie. Second edition. Pp. xxiv+148. (Lon- 

 don : Longmans and Co.) 55. net. 



Occupations : from the Social, Hygienic, and Medi- 

 cal points of View. By Sir T. Oliver. Pp. x+iio. 

 (Cambridge : At the University Press.) 6s. net. 



The Dynamical Theory of Gases. By J. H. Jeans. 

 Second edition. Pp. vi + 436. (Cambridge: At the 

 University Press.) 16s. net. 



Records of the Survey of India. Vol. vii. Annual 

 Reports of Parties and Offices, 1913-14, from ist 

 October, 1913, to 30th September, 1914. Prepared 

 under the direction of Sir S. G. Burrard. Pp. ii + 

 180+ II maps. (Calcutta: Superintendent Govern- 

 ment Printing, India.) 4 rupees, or 6s. 



Union of South Africa. Mines Department. Geo- 

 logical Survey Memoir No. 7 : The Geology and 

 Mineral Industry of South-west Africa. Bv P. A. 

 Wagner. Pp. 234+ plates xli. (Pretoria : Government 

 Printing and Stationery Office.) 75. 6d. 



Forty-fifth Annual Report of the Deputy Master and 

 Comptroller of the Mint, 1914. Pp. 191. (London : 

 H.M.S.O. ; Wyman and Sons, Ltd.) 35. 6d. 



An Introductory Course of Continuous Current 

 Engineering. By Dr. A. Hay. Second edition. Pp. 

 xii + 360. (London : Constable and Co., Ltd.) 6s. 6d. 

 net. 



Wisconsin Geological and Natural History Survey. 

 Bulletins Nos. xxviii.-xxxii. Soil Series, Nos. 2-6; 

 Bulletins Nos. xxxvii + xl. Soil Series, Nos. 7-10; 

 Bulletins Nos. xxxv and xliv. Economic Series, 

 Nos. 17 and 19. Soil Maps, accompanying Bulletins 

 28 to 32 and 37 to 40 inclusive. Soil Series, 2 to 6 and 

 7 to 10 inclusive. (Madison, Wis. : Published bv the 

 State.) 



Economics : an Introduction for the General Reader. 

 By H. Clav. Pp. xvi + 476. (London : Macmillan and 

 Co.. Ltd.) 3s. 6d. net. 



Medical and VeterinarA^ Entomology. Bv Prof. 

 W. B. Herms. Pp. xii4-393. (London: Macmillan 

 and Co., Ltd.) lys. net. 



DIARY OF SOCIETIES. 



THURSDAY, \VRU. 13. 



Institution of Electrical Engineers, at %.— Discussion : The 

 Present Position of F.lertricity Supply in the United Kingdom ; and the 

 Steps to be taken to Improve and -Strengthen it. 



Child Study Society, at 6.— Experin.ents on Hand-writing in Schools : 

 Dr. C. W. Kimmine, Mrs. Grainger, and Miss Golds. At 7.30. — Annual 

 Meeting. 



Institution OF Naval Architects, at ti a.m.— .Subdivision of Me-chant 

 Vessels : Reports of the Bulkhead Commit'ee, 1912-1915 : Sir Arrhibald 

 Denny. — Strength of Watertight Bulkheads : J. F. King. — Some Effects of 

 the Bulkhead Committee's Reports in Practice : A. T. Wall. At 3. — Notes 

 from a Collision Case : J. Reid. — Shipyard Cranes of the Rotterdam 

 Dockyard Company : M. G. f'e Gelder. 



Royal Geocraphical Society, at 5. —Night Marching by Stars: E. A 

 Reeves. 



Optical Society, at 8. — Practical Workshop and Laboratory Measure- 

 ments: S. D. Chalmers. -'Some Further Notes on Focometry : T. V. 

 Connolly. 



FRIDAY, April 14. 



Royal Institution, at 5.30. — The Genesis and Absorption of X-Rays: Sir 

 J. J. Thomson. 



Institution of Mechanical Engineers, at 6. — Theory and Practice iq 

 the Filtration of Water : W. Clemence. 



Royal Astronomical Society, at 5.— Obser\'ations of the Double Star 

 Krueger 60 : E. E. Barnard. — The Kinetic Energy of a Star Cluster : 

 A. S. Eddington. — Catalogue of Radiant Points of Shooting Stars, 

 1898-1915 : A. King. 



PinslCAL Society, at 5. — The Variation of Resistance with Voltage at a 

 Rectifying Contact of Two Solid Conductor*, with Applications to the 

 Electric Wave Detector : D. Owen. — The Electrical Capacity of a Gold 

 Leaf Electroscope : Dr. T. Barratt. 



SATURDAY, April 15. 

 RovAL Institution, at 3. — Radiations from Atoms and Electrons: Pi 

 J. J. Thomson. 



MONDA Y, .\PRIL 17. 

 Royal Geographical Society, at S.so.^The Development of Rhodesia 

 from a Geographical Standpoint : H. Wilson Fox. 



TUESDAY, April i8. 

 Royal Statistical Socif.ty, at 5.15. 

 Zoological Society, at 5.30. — The External Characters of the Mongoo^' 



(Mungotidae) : R. I. Pocock. — The Poison-Organ of the Sting-Ray 



(.Trygon pastinaca) : Major H. Muir Evans. 

 Institution of Civil Enginep;rs, at 5.30.— Annual General Meeting. 



WEDNESDAY, April 19. 



Royal Microscopical Society, at 8. — Early Stages in the Evolution 

 of Life : Prof. Benjamin Moore. — Studies in Marine Biology : F. Martin 

 Duncan. — Some Suggestions regarding Visual Efficiency in the L'fe of the 

 Microscope and other Optical Instruments: J. W. Purkiss. 



RoVAL Mfteorologk.\l Society, at 7.30 The Persistence of Wet and 



Dry Weather: E. V. Newnham. — Discontinuities in Meteorological 

 Phenomena. Second Note. Prof. H. H. Turner. 



CONTENTS. PAGE 

 Irradiation : Its Physiology, Pathology, and Thera- 

 peutics 137 



The Medium Under the Microscope. By J. A. H. 138 



Analytical Aids for Factory Chemists 139 



Astronomy for Juvenile Readers 139 



Our Bookshelf i40 



Letters to the Editor:— 



Smithsonian Physical Tables.— Dr. C. D. Walcott . 141 

 Effect of Tidal Water in an Estuary oa the Level of 



Subterranean Water. — Jas. Kewley 141 



Is Soap Necessary for Shaving? — G. Arbour 



Stephens 141 



Malaria and Sanitation {^Illustrated.) ByJ. W. W. S. 141 

 The Pollination of Fruit Trees. By Prof. Frederick 



Keeble, F.R.S 142 



Prof. Octave Lignier. By A. C. S 143 



Notes 144 



Our Astronomical Column :— 



Comet 1916a (Neujmin) 148 



Occultation of Mars, October 2, 191 5 148 



The Radiation Laws and Stellar Photometry .... 148 



Dark Markings in the Sky 148 



A Cluster of Nebulae in Cetus 148 



The New Chemical Laboratories at University Col- 

 lege, London. {Illustrated.') 148 



Instrumental Harmonic Synthesis. {Illustrated.) . . 15° 



Cements and Clays. ByJ. A. A. . 15° 



Productive Research in the United States .... 150 



University and Educational Intelligence i53 



Societies and Academies i54 



Books Received IS5 



Diary of Societies ij 



Editorial and Publishing Offices : 



MACMILLAN & CO., Ltd., 



ST. MARTIN'S STREET, LONDON, W.C. 



Advertisements and business letters to be addressed to the 

 Publishers. 



Editorial Communications to th^ Editor. 

 Telegraphic Address : Phusis, London. 

 Telephone Number : Gebrard 8830. 



NO. 2424, VOL. 97] 



