M 



NATURE 



[May 22, 1913 



and E. A. Browne. Pp. xxxv + 7 + 264. (London: A. 

 and C. Black.) 2s. 6d. net. 



School and Home Gardens. By W. H. D. Meier. 

 Pp. v + 319. (Boston, Mass., and London : Ginn and 

 Co.) 4s. 



An Introduction to the Mathematical Theory of 

 Heat Conduction. With Engineering and Geological 

 Applications. By Prof. L. R. Ingersoll and O. J. 

 Zobel. Pp. vi + 171. (Boston, Mass., and London: 

 Ginn and Co.) 7s. 6d. 



Agronomy : a Course in Practical Gardening for 

 High Schools. By W. N. Chute. Pp. xvi + 296. 

 (Boston, Mass., and London : Ginn and Co.) 4s. 6d. 



A Course in General Chemistry. By Profs. W-. 

 McPherson and W. E. Henderson. Pp. viii + 556. 

 (Boston, Mass., and London : Ginn and Co.) 10s. 6d. 



Lehrbuch der spharischen Astronomic By Dr. L. 

 de Balh, Pp. XV4-387. (Leipzig: W. Engelmann.) 

 20 marks. 



Ueber das Wesen der Mathematik. By Dr. A. 

 Voss. Zweite Auflage. Pp. iii+123. (Leipzig and 

 Berlin : B. G. Teubner.) 4 marks. 



The Riddle of the Universe. By E. Haeckel. 

 Translated by J. McCabe. Pp. xxviii + 324. (London: 

 Watts and Co.) <)d. net. 



L'Homme Fossile de la Chapelle-aux-Saints. By 

 Prof. M. Boule. Pp. 278 + xvi plates. (Paris: Mas- 

 son et Cie.) 50 francs. 



Journal of the British Fire Prevention Committee. 

 No. x. The Record of the Special Commission 

 formed by the British Fire Prevention Committee to 

 Visit Russia, being a Diary and Notes compiled by 

 E. O. Sachs. (London : British Fire Prevention Com- 

 mittee.) 10s. 6d. 



Handbuch der Morphologie der wirbellosen Tiere. 

 Edited by A. Lang. Zweite Bezw. Dritte Auflage. 

 Band I. Lief. 1. (Jena : G. Fischer.) 5 marks. 



Black's Sentinel Readers. By Prof. E. E. Speight. 

 Book iii. Pp. viii+ 1S4. (London : A. and C. Black.) 

 is. 4<J. 



DIARY OF SOCIETIES. 



THURSDAY, May 22. 



1 Lecture : Rays of Positive Electricity : 

 I. Molecular 



Royal Society, at 4.30.— Baki 



Sir J. J. Thomson. 

 Royal Institution, at 3. — Recent Chemical Ad\ 



Architecture: Prof. W. j. Pope. 

 Concrete Institute, at 4.30. — Annual General Meeting. 

 Institution of Mining and Metali urgy, at 8. — The Determination of 



Water in Coal : P. L.Teed.— Grading -Analyses by^Elutriation : H. Stadler. 



—Notes on Sinking Operations at the Spring Mines, Transvaal: B. D. 



Bushell. — An Early Example of E last-roasting : H. Vassiliadi. 

 FRIDAY, May 23. 

 Royal Institution, at p. — The Secret of the Permanent Magnet : Prof. 



S. P. Thompson. 



SATURDAY, May 24. 



Royal Institution, at 3.— Radio-activity. I. The a Rays and their 

 Connection with the Transformations : Prof. E. Rutherford 

 MONDAY, May 26. 



Royal Geographical Society, at 3. — Anniversary Meeting. 

 TUESDAY, May 27. 



Royal Institution, at 3. — Recent Advances in the Production and 

 Utilisation of Wheat in England : Prof. T. B. Wood. 



Royal Anthropological Institute, at 8.15.— Sub-Crag Flints: Sir 

 Edwin Ray Lankester, K.C.B. 



WEDNESDAY, May 28. 



Geological Society, at 8.— The Age of the Suffolk Valleys, with Notes on 

 the Buried Channels of Drift : P. G. H. Boswell.— The Internal Structure 

 of Upper Silurian Rugose Corals, from the Grindrod Collection, Oxford 

 Museum: D. E. Innes. 



British Astronomical Association, at 5. 



THURSDAY, May 29. 



Royal Society, at 4.30. — Probable Papers : Aeincta tuberosa ; a Study on 

 the Action of Surface Tension in Determining the Distribution of Salts in 

 Living Matter : Prof. A. B. Macallum.— Morphology of Various Strains 

 of the Trypanosome cau-ing Disease in Man in Nyasaland. IV. The 

 Mzimba Strain : Surg.-General Sir David Bruce, Major D. Harvey, 

 Major A. E. Hamerton, and Lady Bruce.— Notes on Plasma gondii: 



Helen L. M. Pixell. — An Investigation by Pedigree Breeding into the 

 Polymorphism of Papilio polvtcs. Linn. : J. C. F. Fryer. — The Action 

 of Radium Rays up- n the Cells of Jensen's Rat Sarcoma : Dr. S. Russ 

 and Dr. Helen Chambers. 



Royal Institution, at 3. — Recent Chemical Advances. II. Chemistry in 

 Space : Prof. W. J. Pope. 



Royal Society of Arts, at 4 30.— Indian Section.— Irrigation Works in 

 India : Sir John Benton, K.C.I. E. 



FRIDAY, May 30. 



Institution of Electrical Engineers, at 8. — Annual General Meeting. 

 At 8.30. — Practical Application of Telephone Transmission Calculations : 

 A. J. Aldridge 



Physical Society, at 5— The Origin of New Stars : Prof. A. W. Bickerton. 

 —Electro-thermal Phenomena at the Contract of Two Conductors with a 

 Theory of a Class of Radio-telegraph Detectors: Dr. W. H. Eccles.— 

 The Evaluation of Certam Combinations of the Ber, Bei, and Allied 

 Functions : S. Butterworth. — The Extraordinary Ray Resulting from the 

 Internal Reflection of an Extraordinary Ray at the Surface of an UniaxaV 

 Crjstal: J. Walker. 



SA TURD A Y, May 31. 



Roval Institution, at 3.— Radioactivity. 1 1. The Origin of the Beta and 

 Gamma Rays and the connection between them : Prof. E. Ruthelford. 



CONTENTS. page 



The Royal Society's Subject Index. By G. C. F. 289 



A New Text-book of Mineralogy 291 



Heredity and Related Studies 292 



Von Richthofen's "China" '■ . 293 



Our Bookshelf •. 294 



Letters to the Editor: — 



Reflection of X-Rays and Related Phenomena. — M. 



de Broglie ; Dr. F. A. Lindemann 295 



Stratigraphical Problems in New Zealand. — Prof. P 



Marshall ; G. A. J. C 295 



Dana's Proof of Darwin's Theory of Coral Reefs.— 



Dr. John Ball 296 



Sub-Red Crag Flint Implements and the Ipswit 1 



Skeleton.— J. Reid Moir 296 



Openings Required for Laboratory Assistants. — G. E. 



Reiss 296 



The Use of Spectacles with Optical Instruments. — 



Herbert S. Ryland 297 



Natural History and Sport. (Illustrated.) By R. I. T. 297 

 The Production of Apparent Relief by " Kino- 



plastikon." (With Diagram.) 29S 



Eradication of Plant Diseases 299 



Notes 300 



Our Astronomical Column : — 



Comet Gale (1912a) 304 



The Spectra of Spiral Nebulas and Globular Sta 



Clusters ■ 3°4 



Reports on Indian Observatories 3°4 



" L'Astronomie " for May 3°4 



The Parallax of the Nebula G.C. H7 = N.G.C. 221 . 304 



Teaching of Mathematics in Germany 305 



The Association of Teachers in Technical Insti- 

 tutions. By J. Wilson 305 



The National Physical Laboratory 306 



Atmospheric Refraction Irregularities 3°° 



Properties and Structure of Ice 3°7 



The Winds in the Free Air. By Charles J. P. Cave 307 



University and Educational Intelligence 311 



Societies and Academies 3" 



Books Received 3'3 



Diary of Societies 314 



NO. 2273, VOL. 91] 



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Editorial Communications to the Editor. 

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