6o8 



NATURE 



[July 7, 192 1 



Baralong and other tribes, the regiment lists, running 

 back to 1750, indicate where the split between different 

 branches occurred. It is sought to carry them far 

 enough back to illustrate the fission of the tribes 

 now distinct from one another, to which tradition 

 points, but the rapid passing of the old people makes 

 this increasingly difficult and urgent. These lists are 

 of Value to history and philology, for they aid in 

 dating events. 



Books Received. 



Nedb0riakttagelser i Norge utgitt av det Norske 

 Meteorologiske Institutt. Middelverdier, Maksima og 

 Minima. Pp. ix+61 + 17 plates. (Kristiania : H. 

 Aschehoug and Co.) Kr. 6.00. 



Valenzkrafte und Rontgenspektren zwei Aufsatix; 

 iiber das Elektronengebaude des Atoms. By Prof. W. 

 Kossel. Pp. iv + 70. (Berlin: J. Springer.) 12 

 marks. 



Transactions of the Royal Society of Edinburgh. 

 Vol. Hi., part iv. (No. 31). Shackleton Antarctic Ex- 

 pedition, 1914-1917 : The Natuial History of Pack-ice 

 as Observed in the Weddell Sea. By J. M. Wordie. 

 Pp. 795-829 + 4 plates. (Edinburgh: R. Grant and 

 Son ; London : Williams and Norgate.) 8s. 



Tier und Pflanze in Intrazellularer Symbiose. By 

 Prof. P. Buchner. Pp. xi+462 + 2 Tafel. (Berlin : 

 Gebrijder Borntraeger.) 114 marks. 



Les Ressources du Travail Intellectuel en France. 

 By E. Tassy and P. L^ris. Pp. xxi+711. (Paris: 

 Gauthier-Villars et Cie.) 50 francs. 



Prices and Wages : An Investigation of the Dynamic 

 Forces in Social Economics. By P. Wallis and A. 

 Wallis. Pp. xii+456. (London : P. S. King and 

 Son, Ltd.) 25s. net. 



Studies of the Development and Larval Forms of 

 Echinoderms. By Dr. TTi. Mortensen. Pp. iv + 26i + 

 xxxiii plates. (Copenhagen : G. E. C. Gad.) 



Royal Botanic Gardens, Kew. Bulletin of Mis- 

 cellaneous Information, 1920. Pp. iv-J-384+4i. los. 

 net. Additional series XI. : General Index to the 

 Volumes of the Kew Bulletin for the Years 1887-1918. 

 Pp. 202. 7s. 6rf. net. (London : H.M. Stationery 

 Office.) 



Technology of Cellulose Esters. By E. C. Worden. 

 (In 10 vols.) Vol. i. Part i., Cellulose, Starch, 

 Cotton. Pp. cxxv+664. Part ii., Nitric, Sulfuric, 

 Mixed Acids. Pp. cxxvii + 665-1566. Part iii.. Nitro- 

 cellulose : Theory, Practice. Pp. cxvii+ 1567-2376. 

 Part iv.. Historical Development. Pp. cxvii -1- 2377- 

 3086A. Part v.. Index. Pp. 3087-3709. (London: E. 

 and F. N. Spon, Ltd.) loZ. los. net (5 parts). 



Manuel de Vannerie : Technologie Vanniere. By 

 E. Leroux and Prof. R. Duchesne. Pp. 376. (Paris : 

 J. B. Bailliere et Fils.) 10 francs. 



The Journal of the Institute of Metals. Vol. xxv., 

 No. I, 192 1. Edited by G. Shaw Scott. Pp. xiv + 

 522 + xxvii plates. (London : The Institute of Metals.) 

 31S. 6d. net. 



University of Bristol. The Annual Report of the 

 Agricultural and Horticultural Research Station 

 (The National Fruit and Cider Institute), Long 

 Ashton, Bristol, 1920. Pp. 102 + 4 plates. (Bristol.) 



Primitive Society. By Dr. R. H. Lowie. Pp. viii + 

 453. (London : G. Routledge and Sons, Ltd.) 21s. 

 net. 



Thermionic Tubes in Radio Telegraphy and Tele- 



NO. 2697, VOL. 107] 



phony. By J. Scott Taggart. Pp. xxiii + 424. 

 (London : Wireless Press, Ltd.) 255. 



Geological Literature added to the Geological 

 Society's Library during the Year ended December 31, 

 19 13. Pp. 247. (London : Geological Society.) 55. 



Life of Alfred Newton. Professor of Comparative 

 Anatomy, Cambridge University, 1866-1907. By 

 A. F. R. Wollaston. Pp. xv + 332. (London: J. 

 Murray.) i8s. net. 



The Physical Society of London : Proceedings. Vol. 

 xxxiii.. Part iv. Pp. 207-285. (London : Fleetway 

 Press, Ltd.) 65. net. 



Diary of Societies. 



TMURSDAY, July 7. 

 Medico-Legal Society (Anniial General Meeting) (at 11 Chandotf 

 Street, W.l), at 8.30.— Prof. A. Louise Mcllroy : Some Factors 

 in the Control of the Birth-rate. 



MONDAY, JtJLT 11. 

 RoYAi Botanic Society of London, at 3.— Prof. A. R. Biokerton : 

 The Generic Simplicity and Great Importance of Basic Principles 

 in all Scientific Work. II. The Importance in Biological Science 

 of a Clear Comprehension of the Orbit and Axial Inclination of 

 the Earth. 



CONTENTS. PAGE 



Internationalism 577 



What Relativity in Science Implies. By Prof. H. 



Wildon Carr . 578 



A New Book on Cactaceae. By N. E. Brown . . 580 



A Study in Geo-chemistry. By Prof. H. Louis 581 



Our Bookshelf 582 



Letters to the Editor:— 



Pathogenic Organisms in the Pollen of Flowers and 

 Disease in Bees. —Hon. Col. C. J. Bond, 



C.M.G . 584 



The Nature of the Electrical Conductivity of Glass. — 



Horace H. Poole 584 



The Displacement of S{iectral Lines by a Gravita- 

 tional Field.— Prof. H. J. Priestley 585 



The Measurement of Single and Successive Short 



Time-Intervals. — Prof. Alan Pollard 585 



Sex-change in the Native Oyster (O. edulis). — Dr. 



J. H. Orton 586 



A New Acoustical Phenomenon. — Dr. H. Hart- 

 ridge ; H. S. Rowell; Prof. W. B. Morton 586 

 An Algebraical Identity. — Dr. H. C. Pocklington, 



F.R.S. ; Rev. J. Cullen, S.J 587 



Artefacts arid their Geological Age. — T. Sheppard . 587 



Iron Currency-Bars.— O. G. S. Crawford . . . 587 



History of the Churn. — R. Hedger Wallace ... 587 

 Cosmogony and Stellar Evolution. II. By J. H. 



Jeans, Sec.R.S. . 588 



The Edinburgh Meeting of the British Associa- 

 tion. By Prof. J. H. Ashworth, F.R.S. . . 590 

 Annual Visitation of the National Physical 



Laboratory ... .... 592 



Scientific Publications for Russia ... 594 

 Friendship. (To T. H. R.) By Prof. Walter 



Garstang 594 



Conference of American and British Engineers 594 

 Obituary : — 



Abbott H. Thayer. By E. B. P. 596 



Notes . ... ...... 597 



Our Astronomical Column : — 



The Cape Observatory 601 



The Comet Pons-Winnecke 601 



The Figure of the Earth 601 



Sir Ernest Shackleton's New Expedition. By 



R. N. R. B. 602 



Milk Customs cf Bunyoro, Central Africa .... 602 



Trees and Shrubs of Mexico 603 



University and Educational Intelligence . . . 603 



Calendar of Scientific Pioneers 604 



Societies and Academies .... 6o? 



Books Received . 608 



Diary of Societies 608 



