6io 



NATURE 



[January 28, 19 15 



Papers set in the Qualifying Examination for the 

 Mechanical Sciences Tripos, 1906-19 13. Pp. 90. 

 (Cambridpfc I'niversity Press.) 25. net. 



Advanced Inorj>fanic Chemistry. By P. W. Oscroft. 

 Pp. viii + 504. (London: G. Bell and Sons, Ltd.) 

 5s. net. 



Economic Cycles : Their Law and Cause. By Prof. 

 H. L. Moore. Pp. yiii+149. (London: >Lacmillan 

 and Co., Ltd.) 8s, 6rf. net. 



Homogeneous Linear Substitutions. bv Dr. H. 

 Hilton. Pp. viii t- 184. (Oxford: Clarendon Press.) 

 \2S. 6d. net. 



Materials of Machines. By A. W. Smith. Second 

 edition. Pp. v + 215. (New York : J. Wiley and Sons, 

 Inc. ; London : Chapman and Hall, Ltd.) 5s. 6d. net. 



Machine Shop Practice. By W. J. Kaup. Second 

 edition. Pp. xii4-i99. (New York: J. Wiley and 

 Sons, Inc. ; London : Chapman and Hall, Ltd.) 

 5s. 6d. net. 



Mechanism of Steam Engines. By \\'. H. James 

 and M. W. Dole. Pp. viii +170.' (New York: 

 J. Wilev and Sons, Inc. ; London : Chapman and 

 Hall, Ltd.) 8s. 6d. net. 



Quain's Elements of Anatomy. Eleventh edition. 

 Vol. iv. Part i. Osteology and Arthrology. By Dr. 

 T. H. Bruce. Pp. viii + 329. (London : Longmans 

 and Co.) 12s. 6d. net. 



Inorganic Plant Poisons and Stimulants. Bv Dr. 

 W. E. Brenchley. Pp. ix+iio. (Cambridge Univer- 

 sity Press.) 5^. net. 



Tables Annuelles de Constantes et Donnees 

 Numeriques, de Chimie, de Physique, et de Tech- 

 nologi^ie. Vol. iii. Annee 1912. Pp. Hi + 595. 

 (Paris : Gauthier Villars et Cie. ; Lon4on : J. and A. 

 Churchill.) 28s. 6d. net. 



The Determination of Sex. By Dr. L. Doncaster. 

 Pp. xii f-172. (Cambridge L^niversity Press.) 7s. 6d. 

 net. 



DIARY OF SOCIETIES. 



THURSDAY, January 28. 



Royal Society, at 4.^0.— The Influence of Salt-conceniration on 

 Hemolysis: W. W. C. Topley.— The Life-cycle of Cladocera, with 

 Remarks on the Physiology of Growth and Reproduction in Crustacea : 

 G. Smith. — Investigations on Protozoa in Relation to the Factor Limiting 

 Bacterial Activity in SoM : T. Goodey.— The Mesodermic Origin and the 

 Fate of the so-called Meseclodfrm in Petromyzon : S. Hatta.— The 

 Influence of HomoHromous and Heterodromous Electric Currents on 

 Transmission of Excitation in Plant and Animal: Prof. J. C. Rose. 



Royal Institution, at 3.— Modern Theories and Methods in Medicine- 

 Immunity : H. G. Plimmer. 



Institution OF Electrical Engineers at 8.— The Sixth Kelvin Lecture 

 Lord Kelvin's Work on Gyrostatics : Prof. A. Gray. 



FRIDAY, January 29. 



Royal Institution, at 9.— Gaseous Explosions: Dr. Dugald Clerk. 



SATURDAY, January 30. 



Royal Institution, at 3.— Aerial Navigation— Scientific Principles: 

 Dr. R. T. Glazebrook. ^ 



Essex Field Club (at the Essex Museum of Natural History, Stratford), 

 at 6 —Paget Colour Photography as applied to Natural History : H. 

 Whitehead.— The Hammer and the Cam»ra : W. Whitaker. 



MONDAY, February i. 

 Society of Chemical Industry^ at 8. 

 Aristotelian Society, at 8.— Conflicting Obligations in the State: 



G. H. D. Cole. 

 Royal Socibtv of Arts, at 8.— Oils, their Production and Manufacture : 



Dr. F. Mollwo Perkin. 

 Victoria Institute, at 4.30.— Present Position of the Theory of Organic 



Evolution : Pi of. E. W. MacBride. 

 Society of Engineers, at 7.30. — Presidential Address : N. Scorgie. 



TUESDAY, February 2. 



Royal Institution, at 3.— Muscle in the Service of Nerve : Prof. C. S. 



Sherrington. 

 Royal Society of Arts, at 4.30.— Sugar and the War : E. R. Davson. 



WEDNESDAY, Februakv 3. 



Society of Public Analysts, at 8. — Annu.il General Meeting. — Presi- 

 dent's Address. — Note on the Determination of Sulphates in Flour : G. D. 

 Elsdon. — General Principles Governing the Complete Analysis of Minerals 

 and Ores : Dr. W. R. Schoeller. 



Royal Society of Arts, at 8. — Imperial Industrial Development after 

 the War : O. C. Beale. 



Institution of Electrical Engineers, at 7.30. — Student's Meeting. 

 High Explosives: H. Williams. 



Entomological Society, at 8. 



Geological Society, at 8. — The Gravels of East Anglia: T. McKenny 

 Hughes. — The Pitchslones of Mull and their Genesis : E. M. Anderson 

 I and E. G. Radley. 



THURSDAY, February 4. 



Royal Society, at 4.30. — Ptobable Papers: Discontinuous Fluid Motion 

 Past a Bent Plane, with Special Reference to Aeroplane Problems : Prof. 

 G. H. Bryan and R. Jones. The Spectra of Ordinary Lead and Lead of 

 Radio-active Oiigin: T. R. Merton.— The Viscosity of the Vapour of 

 Iodine : A. O. Kankine. 



Royal Institution, at 3. — Modern Theories and Methods in Medicine 

 Methods and Results : H. G. Plimmer. 



FRIDAY, February 5. 



Royal Institution, at 9. — Science and Industrial Problems : Prof. A. W. 



Crossley. 

 Geologists' Association, at 7 30. — Annual General Meeting. 



CONTENTS. PAGE 



A Treatise on Useful Minerals and Rocks .... 583 



The Sidereal Problem. By H. C. P 584 



The Enamelling Industry. By W. G 585 



New Books on Chemistry. By J. B. C 586 



Our Bookshelf 587 



Letters to the Editor : — 



Electrical Notation,— Sir Oliver Lodge, F.R.S, 588 

 Mendelism in the Seventeenth Century. — Clifford 



Dobell 588 



Books for Belgian Students.— Dr. A. E. Shipley, 



F.R.S. 589 



An Unexplained Laboratory Explosion. — W. F. A. 



Ermen 589 



Demonstration of Strain-hardening of Steel. {Illus- 

 trated).— Vroi. R. W. Chapman 589 



By-Paths in Natural History. {Illustrated.) .... 590 



The New Issue of the British Pharmacopoeia . . 592 

 Synthetic Drugs in Great Britain. By Prof. J. F. 



Thorpe, F.R.S ■ -593 



Notes 594 



Our Astronomical Column :— 



Annual Report of the U.S. Naval Observatory ... 599 



The Appley Bridge Aerolite 599 



Annuaire du Bureau des Longitudes, 19x5 599 



The Theory of a Sunspot Swarm of Meteors .... 599 

 The Restoration of an Ichthyosaur. {Illustrated.) 



By R. L 599 



Development of the Culms of Grasses. By F, C. 600 



Paris Academy of Sciences 601 



Problems of Production in Agriculture. By A. D. 



Hall, F.R.S 601 



University and Educational Intelligence 606 



Societies and Academies 607 



Books Received 6o9 



Diary of Societies 610 



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