620 



NATURE 



[January 6, 1921 



for the Viar ended 31st March, 1920. Pp. vii + 242. 

 (London : H..M. Stationery Office.) 2S, net. 



.Meteorolojjical Office. Air Ministry. British 

 Rainfall, 1919. The Fifty-ninth Annual Volume of 

 the British Rainfall Organization. Pp. xxviii + 268. 

 (London : H.M. Stationery Office.) lis. 6d. net. 



L'Alimentation et I'Elevage Rationnels du Betail. 

 (Opinions du Prof. A. Mallfevre.) By J.-E. Luca^.. 

 Pp. 466+4. (Paris : Librairie Lefranijois.) 18 francs. 



The University of Chicago. Publications of the 

 Yerkes Observatory. Vol. iv., part iii. Parallaxes of 

 Fifty-two Stars. By G. van Biesbroeck and Mrs. 

 H. S. Pettit. Pp. 36. (Chicago: University of 

 Chicago Press ; London : Cambridge University 

 Press.) 1.50 dollars net. 



Hydro-Electric Survey of India. Vol. ii. Second 

 Report on the Water Power Resources of India. 

 Ascertained during the Season 1919-20. By F. E. Bull 

 and J. W. Mcares. Pp. 123. (Calcutta : Government 

 Printing Office.) 1.6 rupees. 



, Analysa Kvalitativnf pro PosluchaCe (Zac^teinfky) 

 Cesk^ t'niversity. (Qualitative Analysis for Students 

 (Beginners) of the Bohemian University.) By Prof. 

 Dr. B. Brauner and Dr. J. Kfepelka. Pp. 179. 

 (Prague : Ceskoslovensk^ L(5kdnick(5 Spolei^nosti.) 



Geologists' Association, London. An Index to the 

 Proceedings of the Geologists' Association, vols, xxi.- 

 XXX., 1909-19. Pp. 44. (London : E. Stanford, Ltd.) 



Design and Tradition : A Short Account of the 

 Principles and Historic Development of Architecture 

 and the Applied Arts. By A. Fenn. Pp. XX-I-376+ 

 plates. (London : Chapman and Hall, Ltd.) 305. net. 

 The Growth and Shedding of the Antler of the Deer : 

 The Histological Phenomena and their Relation to the 

 Growth of Bone. By W. Macewen. Pp. xvii+iog. 

 (Glasgow : Maclehose, Jackson and Co. ; London : 

 Macmillan and Co., Ltd.) 10.9. 6d. net. 



The Principle of Relativity. Original Papers bv 

 A. Einstein and H. Minkowski. Translated into 

 English bv M. N. Saha and S. N. Bose. Pp. xxiii-f 

 186. (Calcutta : LIniversitv.) 



Diary of Societies. 



I TUURSDAY, jAXTAiir 6. 



ROVAL Sot IF.TV OF Abts. at 3.— .Sir Frederick Bridg-c : The Crie.s 

 of London nhicli Children heard in Shakespeare's Time (Juvenile 

 Lecture). 



Royal Ixstitvtios of Gheat Britain, at 3.— Prof. J. Arthur Thom- 

 son : The Haunts of Life: The Frcshwaters (Juvenile Lectures). 



Physical Society and Optical Society's Exhibition (at Imperial 

 CoUe^re of Science), from 3 to 10.— At 4.— Prof. A. Barr : The 

 Oirtophone.— At 8.— C. R. Darling- : Some Unusual Surface Tension 

 Phenomena. 



Royal Society or JIedicinf, (Obstetrics and Gvnaieolos-v Section), 

 at 8.— Dr. Louise Mcllroy : The Use of Morphia in' Labour.— 

 P. Cole : A Series of 43 Cases of Inonerable Uterine Carcinoma 

 treated by the Cold Cautery Method of Percy. 



FniBAY, Janiahy r. 

 Royal Geographical Society (at .^lolian Hall), at 3.30.— Lt.-Col. C. 



Smith: Life on the Gil^it Frontier (Christmas Lecture). 

 JfNiOR Institction OF Enoineers (at Caxton Hall), at 8.— H. G. 



Pusey : The Indicator : Its Use and Application. 



S.tTFRD.ir, .jANtlAKY 8. 



Royal Instititiox of Gbeat Britain, at 3.— Prof. J. Arthur Thom- 

 son : The Haunts of Life : The Conquest of the Land (Juvenile 

 Lectures). 



MONDAY, Jancary 10. 



INSTITITION- or .Mechanical Encineebs (Graduates' Meeting), at 7.— 

 A. H. Fuller: The Artificial Production of Ice. 



Strveyoss' Institution, at 8.— W. W. Jenkinson : The Streets of 



• London before the Great Fire. 



BOYAL Geographical Society (at .F;olian Hall), at 8.30.~Capt. 

 J. B. L. Noel : .A Reconnaissance in Persia North of the Elburz. 



TVESUAY. Jancaby 1L 

 Royal Institction of Great Britain, at 3.— Prof. J. .\rthur Thom- 

 son : The Haunts of Life : The Mastery of the Air (Juvenile 

 Lectures). 



NO. 2671, VOL. 106] 



IlOYAI. HOUTICILTCKAL SOCIETY, at 3. 



l.\.sTinTiox or Civil Exoineebs, at 5.30. 



IvstiTciE or INDCSTHIAL AuHiNisTBATio.v (in Central Hall, \\es- 



minster), at 7. — \V. J. Mulden : The 3Iea8Ure of Output in Ajfn- 



culture. 

 Royal Photookaphic Society or Obeat Bbitaik, at 7. — J. Bbeiu- 



berg ; Some New Directions for Photographic Research. — F. C. 



Toy : A 3Ionochromatic Illuminator of Special Design. 

 QuESEii MiCBOsconcAL Clib (at 11 Chandos Street, W.l), at 7.90. 

 Royal Anthbopolocical Ixstitcte, at 8. 10. —Prof. C. O. Seligmao : 



The Older Pala'olithic Age in Egypt. 

 Royal Society or Medicine (Psychiatry Section), at 8J0.— Dr. 



Morowoka : The Morbid Conditions of the Choroid Plexus in 



Mental Disease (Illustrated by Epidiascope). 



WEDNESDAY, Ja.xcaet 12. 



Royal Society of Arts, at 8.— Dr. C. S. Sl.vers : Indnstrial Fatigue 

 (Aldred Lecture). 



Institction of Automobile Engineer.s (at Institution of Hechanieai 

 Engineers), at 8. — Capt. S. Bramley-iloore : Recent DeTelopmcnt.- 

 in rransmi.ssion. 



THURSDAY, Jancaby 13 



London Mathematical Society (at Koval .\stronomical Societv), at j. 

 —A. C. l)i.Yon : The Theory of a 'Thin Elastic Plate, Bounded by 

 Two Circular Ares and Clamped. — A. 8. Eddington : Dr. Shcp- 

 pard's Method of Reduction of Error by Linear Compounding. — 

 M. Kussler : The Zeros of Analytic Functions. — G. A. Miller; 

 Determination of all the Characteristic Sub-groups of an Abeliun 

 Group. — E. A. Milne : A Problem concerning the Maxima of 

 Certain Types of Sums and Integrals. — H. J. Priestley : The 

 Linear Differential Equation of the Second Order. — W. F. Shep- 

 pard : Conjugate Sets of Quantities. 



Institution of Electrical Engineers (at Institution of Civil 

 Engineers), at 6. — Sir William Bragg: Electrons (Kelvin L<*c- 

 ture) , 



Optical Society (at Imperial College of Science), at 7.45. — 

 Prof. W. Salomonson : .A New Ophthalmoscope. — H. Dennis Taylor : 

 An Anastigmatic Flat Field Telescope and its Application to 

 Prismatic Binoculars.— Inst.-Comdr. T. T. Baker : A Note on 

 Multiple Reflection. 



Royal Society of AIedicine (Neurology Section), at 8.30. — Informal 

 Meeting for Free Discussion. 



FRIDAY. Jancaby 14. 

 Royal .Vsthonomical Society, at 5. 



Royal Socifty of Medicine (Clinical Section), at .5.30- 

 RoYAL Society or Medicine (Ophthalmology Section), at 8.30.- 

 Dr. R. Pickard : Variations in the Siie of the Physiological Cop, 

 and their Relation to Glaucoma.— B. T. Lang : Scotometry. 



CONTENTS. 



PAGE 



. 589 



590 



. 592 



• 593 

 - 594 



• 594 



The Cost of- Education 



Territory and Bird Behaviour. By C. LI. M. . 



Airscrews in Design and Performance 



Nomography 



Metallurgy for Dental Surgeons. By T. M. L. . . 



Our Bookshelf 



Letters to the Editor: — 



Heredity and Acquired Cliaracters. — Sir G. Archdall 



Reid, K.B E ... .596 



The British Committee for Aiding Men of Letters 

 and Science in Russia. — Lord Montagu of 



Beaulieu, and Others 598 



The Pea-crab {Pinnotheres pisum). — Right Hon. 



Sir Herbert Maxwell, Bart., F.R.S 599 



The Mechanics of Solidity.— Dr. H. S. Allen ... 599 

 The Meteorology of the Antarctic. — Dr. G. C. 



Simpson, F.R.S 599 



The Mammals of South Africa. {JWusUatei.'S . ■ ■ 600 

 Science of Ventilation and Open-air Treatment. 



By M. F 601 



The Discovery of Fossil Remains of Man in Java, 

 Australia, and South Africa. By Prof. A. Keith, 



F.R.S 603 



Obituary 605 



Notes . . 606 



Our Astronomical Column : — 



Comets 610 



Disappearance of Saturn's Rings 610 



Kodaikanal Observatory . . 610 



Bi'th and Growth of Science in Medicine. By Sir 

 Frederick Andrewes, F.R.S. . . .... 611 



Wheat from Seed-bed to Breakfast-table .... 614 



The Origin of Primary Ore Deposits 615 



University and Edu ational Intelligence 615 



Calendar of Scie tific Pioneers 617 



Societies and Academies ... 617 



Books Received 619 



Diary of Societies 620 



