May 26, 192 1 ] 



NATURE 



4i5 



Books Received. 



Priestley in America, 1794-1804. By Edgar F. 

 Smith. Pp. V+173. (Philadelphia: P. Blakiston's 

 Son and Co.) 1.50 dollars net. 



How to Teach Agriculture : A Book of Methods in 

 this Subject. By Prof. Ashley V. Storm and Dr. 

 Kary C. Davis. Pp. vii + 434. (London : J. B. Lippin- 

 cott Co.) 125. 6d. net. 



Geography : Physical, Economic, Regional. By 

 James F. Chamberlain. (School Text Series.) Pp. 

 xviii + 509. (London: J. B. Lippincott Co.) 15s. net. 

 Practical Geometry for Builders and Architects. 

 By J. E. Paynter. (Directly-Useful Technical Series.) 

 Pp. xii + 409. (London : Chapman and Hall, Ltd.) 

 15.V. net. 



The Elements of Direct Current Electrical Engineer- 

 ing. By H. F. Trewman and G. E. Condliffe. Pp. 

 vii + 219. (London: Sir I. Pitman and Sons, Ltd.) 

 ys. 6d. net. 



Bibliographic des Series Trigonometriques : avec un 

 Appendice sur le Calcul des Variations. By Maurice 

 Lecat. Pp. viii+168. (Louvain : M. Lecat.) 



Engineering Electricity. By Prof. Ralph G. Hudson. 

 Pp. viii+190. (New York: J. Wiley and Sons, Inc.; 

 London : Chapman and Hall, Ltd.) ns. 6d. net. 



Logic. By W. E. Johnson. Part i. Pp. xl+255. 

 (Cambridge : At the University Press.) 165. net. 



Abridged Callendar Steam Tables : Fahrenheit Units. 

 By Prof. H. L. Callendar. Pp. 8. (London : E. 

 Arnold.) 



.^bridp"ed Callendar Steam T.ibles : Centigrade 

 Units. By Prof. H. L. Callendar. Pp. viii. (London : 

 E. Xrnold.) 



The Hilger Interferometer for Measuring the 

 Aberration of Camera Lenses. Pp. 2^. (London : 

 Adam Hilger, Ltd.) 



Rules of Golf, as aporoved bv the Royal and Ancient 

 Golf Club of St. Andrews, September 28, 1920. In 

 force as from Mav i, iq2i. Pp. xiii + 36. (London : 

 Roval Insurance Co., Ltd.) 



Impressions and Comments. Bv Havelock Ellis. 

 Second Series, 1914-1920. Pp. 248. (London : Con- 

 stable and Co., Ltd.) 12s. 



The Age of Power : A First Book of Energv. its 

 Sources, Transformations, and L^ses. Bv J. Rilev. 

 Pp. viii + 248. (London; Sidgwick and Jackson, Ltd.) 

 4s. net. 



String Figures. Bv W. W. Rouse Ball. Second 

 edition. Pp. 69. (Cambridge : At the University 

 Press.) 2S. 6d. net. 



The Chemists' Year Book, 102 1. Edited by F. W. 

 Atack. Vol. i. Pp. vi+422. Vol. ii. Pp. vii-viii + 

 42'!-ii42. (Manchester: Sherratt and Hughes.) 



The Mneme. By Richard Semon. Pp. 304. 

 (London : G. Allen and Unwin, Ltd. ; New York : 

 The Macmillan Co.) i8s. net. 



A History of Psvchology. By Prof. George S. 

 Brett. (Librarv of Philosoohy.') Vol. ii. : Mediaeval 

 and Earlv Modern Period. Pp. 394. Vol. iii. : 

 Modern Psychology. Pp. 322. (London : G. Allen 

 and Unwin, Ltd. ; New York : The Macmillan Co.) 

 ifi/^. net each vol. 



Insanitv and Mental Deficiency in Relation to 

 Le£fal Responsibilitv : A Study in Psvchological 

 Jurisprudence. Bv Dr. William G. H. Cook. Pp. 

 x\iv+iq2. (London: G. Routledge and Sons, Ltd.; 

 N<=>w York : E. P. Dutton and Co.) 105. 6d. net. 



Idromeccanica Plana. By Prof. Umberto Cisotti. 

 Parte nrima. Po. xii-Li;2. (Milano : Libreria Edi- 

 tri/^e Politecnica.) 2d lire. 



The First Assemblv : A Study of the Proceedings 

 of the First Assembly of the League of Nations. 



NO. 2691, VOL. 107] 



Edited by Oliver Brett. Pp. viii-f 277. (London : 

 Macmillan and Co., Ltd.) 35. 6d. net. 



Simple Lessons on the Weather : For School Use 

 and General Reading. By E. Stenhouse. Pp. viii+ 

 135 + xii plates, (Londo'n : Methuen and Co., Ltd.) 

 45. 



The Physical Society of London. Proceedings. 

 Vol. xxxiii., part iii. ' (London : Fleetwav Press, 

 Ltd.) 6s. net. 



Der Bau der Erde. Bv Prof. Leopold Kober. Pp. 

 iv+324+2 Tafeln. (Berlin : Gebruder Borntraeger.) 

 80 marks. 



The Diseases and Pests of the Rubber Tree. Bv 

 T._ Fetch. Pp. x+278+vi plates. (London : Mac- 

 millan and Co., Ltd.) 205. net. 



The Elements of Vegetable Histologv. Bv Prof. 

 C. W. Ballard. Pp. xiv+246. (New York: j'. Wiley 

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

 18.S. net. 



A First Course in Statistics. Bv D. Caradog Jones. 

 Pp. ix+286. (London : G. Bell and Sons, Ltd.)" 155. 

 net. 



The New Stone Age in Northern Eurooe. Bv Prof. 

 John M. Tvler. Pp. xviii+310. (London : G. Bell 

 and Sons, Ltd.) 1^5. net. 



Elementarv Algebra. Bv C. V. Durell and R. M. 

 Wrieht. (Cambridge Mathematical Series.) Part ii. 

 Twith Answers"). Pp. xxiii+253-:;5i + xlvii-lxxxv. 

 (London : G. Bell and Sons, Ltd.) 1:55. 6d. net. 



Gvnecologv. Bv Dr. Brooke M. .Anspach. Pp. 

 xxvi+752. ^London : ]. B. Lippincott Co.) 42s. net. 



A Sketch-Man Geographv : A Text-Book of World 

 and Regional Geographv for the Middle and Upper 

 School. Bv E. G. R. Tavlor. Pp. viii+147. 

 (London : Methuen and Co.. Ltd.) i;^. 



Le Reglement d'Avaries du Grand Abordage. By 

 T?pne E. Bossi^re. Pp. 36. (Paris : Rousseau et 

 Cie.) 



Diary of Societies. 



THURSDAY, Mat 26. 



IxsTiTCTiox or Gas Engineers (at Institution of Civil Engineers), 

 at 10 a.m. 



RoTAL HoBTicuLTUHAL SociETt (at Chelsea), at 3. 



RoTAL Institution of Gbeat Britain, at 3. — E. Law : The Archi- 

 tecture and Art of Hampton Court Palace. II. In Stuart and 

 Later Times. 



RoTAL Society, at 4.30.— Sir Alfred Ewing : The Atomio 

 Process in Ferro-magnetic Induction. — C. D. Ellia : The 

 Magnetic Spectrum of the fJ-rays excited by the y-rays. — 

 S. Datta : The Spectra of the Alkaline Earth Fluorides and their 

 Relation to Each Other. — Dr. W. L. Balls : A Simple Apparatus 

 for Approximate Harmonic Analysis and for Periodicity Measure- 

 ments. — Dr. G. R. Goldsbrough : The Influence of Satellites upon 

 the Form of Saturn's Ring. — Dr. H. Jeffreys : Certain Geologi- 

 cal Effects of the Cooling of the Earth.— T. Kikuchi : The Moving 

 Striations in a Neon Tube (title only). 



IxsTiTrTE OF Pathologt AND RESEARCH (at St. Marv's Hospital, 

 Paddington), at 4.30. — Dr. J. A. Murray: Aims and Progress of 

 the Experimental Study of Cancer. 



Institution or Electrical Engineers (at Savoy Place), at 8. — 

 A. Johnsen and K. Rahbek : A Physical Phenomenon and its 

 Application to Telegraphy, Telephony, etc. 



Concrete Institute (Annual Generaf Meeting), at 7.30.— L. S. 

 White : Land Subsidence and its Effects on Concrete and other 

 Structures. 



RoTAL Society or Medicine (Urologv Section) (Annual General 

 Meeting), at 8.,S0.— V. Z. Cope: Qenito-urinary Symptoms in 

 Acute Appendicitis. 



FRIDAY. Mat 37. 

 RoTAL Society of Arts (Indian and Colonial Sections), at 4.30. — 



Sir Charles H. Bedford : Industrial (including Power) Alcohol. 

 Physical Society of London (at University College), at 5. — The 



General Electric Co. (communicated by C. C. Paterson): A. 



Method for the Micro-analvsis of Gases bv the Use of the Pirani 



Pressure Gauge.- H. Peailing : The Reflection of the K-ray 



Spectrum of Palladium from Fluorspar.— Sir W. H. Brag?: The 

 Intensity of X-rav Reflection by Di-imond.— Exhibits of Crystal 



Models, and of Photoq-raphs by the Due de Broglie of /J-ray 



Snectra produced by X-ravs. 

 RoTAL Botanic Society of London, at .i.l5.— E. Law : Shakespeare's 



Garden, as it was, is now, and is to be. 

 Royal Society of Medicine (Studv of Disease in Children Section) 



