1 68 



NATURE 



[UCTOBER 23. 1919 



that suitable additions to the weight of the charge 

 were made to make up for the addition of the non- 

 explosive material. — M. Bourgeat : The discrvery of 

 coal-bearing schists on the borders of the Serre. — 

 E. Chaput : Remarl^s on the origins and classification 

 of Desmoceras. — F. Morvlllez ; The leaf-conductor 

 apparatus in the Hamamelidaceae and neighbouring 

 forms. — J. Dnfrinoy : Experimental bacterial tumours 

 in pines. This disease is due to a coccus, and is 

 transmissible from tree to tree. The tumour is caused 

 bv a deposit of resin at the infected part. — G. Bazile : 

 New methods for the destruction of Acridians. The 

 experiments were carried out in Algeria on columns 

 of Schistocerca tatarica. Of the methods tried, the 

 use of flame-projectors proved to be the best. — P. 

 Godin : Difference of progression of the index of 

 growth in the male and female sexes. 



Sydney. 

 Royal Society of New South Wales, September 3.- — 

 Prof. C. E. Fawsitt, president, in the chair. — J. H. 

 Maiden : Two new Western Australian species of 

 Eucalyptus. The two species have hitherto been 

 wrongly included in Eucalyptiu; Oldfieldii One is a 

 mallee that was originally collected by the Elder 

 Exploring Expedition in 1891 both in South Australia 

 and in Western Australia. It is now recorded from the 

 Murchison River. It attains a height of about 20 ft., 

 and has a singular, striate bark. The other species 

 grows in damp, sandy land between the Darling 

 Range, south of Perth, and the sea. It is a white 

 gum, and has for many years been confused with the 

 wandoo. — E. Cheel : Three new species of Lepto- 

 spermum. One of the species from North Queens- 

 land, collected bv Dr. E. Mjoberg during the Swedish 

 Scientific Expedition to the Commonwealth in 1913, 

 has been named Leptospermtini Mjohergi in honour 

 of the discoverer. The other two species are found 

 chiefly along the south coast of this State, and include 

 a species which somewhat resembles some of our 

 native Epacris. This has been named Leptospermum 

 epacridioidettm , and the other /,. odoratuni on account 

 of the fragrant oil contained in the leaves. . 



BOOKS RECEIVED. 



Stereochemistry. By Prof. A. W. Stewart. Second 

 edition. Pp. xvi-t-277. (London: Longmans and 

 Co.) 12s. 6d. net. 



Immunity in Health : The Function of the Tonsils 

 and other Subepithelial Lymphatic Glands in the 

 Bodily Economy. By Prof. K. H. Digbv. Pp. viii-l- 

 130. (London : Henry Frowde and Hodder and 

 Stoughton.) Ss. 6d. net. 



Human Vitalitv and Eificiencv under Prolonged 

 Restricted Diet. By F. G. Benedict; W. R. Miles, 

 P. Roth, and H. M. Smith. Pp. xi-l-yoi. (Washing- 

 ton : Carnegie Institution of Washington.) 



A Biometric Study of Basal Metabolism in Man. 

 By J. A. Harris and F. G. Benedict. Pp. vi-t-266. 

 (VVashington : Carnegie Institution of Washington.) 



The Ecological Relations of Roots. By Prof. J. E. 

 Weaver. Pp. vii-(- 1284-30. (Washington: Carnegie 

 Institution of Washington.) 



The Carbohydrate Economy of Cacti. By H. A. 

 Spoehr. Pp. yq. (Washington : Carnegie Institution 

 of Washington.) 



Orthogenetic Evolution in Pigeons. Posthumous 

 Works of Prof. C. Otis Whitman. Vol. i. Edited 

 by O. Riddle. Pp. x-l-iq4 + 88 plates. (Washington: 

 Carnegie Institution of Washington.) 



Inheritance, Fertility, and the Dominance of Sex 

 and Color in Hybrids of Wild Species of Pigeons. 

 Posthumous Works of Prof. C. Otis Whitman. 

 NO. 2608, VOL. 104] 



Vol. ii. Edited by O. Riddle. Pp. TL + 22^+^q plates 

 (Washington : Carnegie Institution of W'ashington. 



The Behavior of Pigeons. Posthumous Works 1 

 Prof. C. Otis Whitman. Vol. iii. Edited by Pro; 

 H. A. Carr. Pp. xi-(-i6i. (Washington: Carneg 

 Institution of Washington.) 



Theorie de Strahlung und der Quanten. Bv Di 

 .A. March. Pp. vii-t-182. (Leipzig: J. A. Barth.,i 

 12 marks. 



Studies of Heredity in Rabbits, Rats, and Mi 

 By W. E. Castle. Pp. iii-t-s6-Kiii plates. (Washin; 

 ton : Carnegie Institution of Washington.) 



A Manual of Phvsics. By Dr. J. A. Crowther. 

 Pp. XX + 537. (London: Henry Frowde and Hodder 

 and Stoughton.) 16s. net. 



DIARY OF SOCIETIES. 



FFfDy^V, October 24. 

 Physical Societv, at 5.— Dr. N. W. McLachlan : Tlie Effect of Pressure 



and Temperature on a Afeter for Measuring the Rate of F'ow of a Gas. 



—J. H. SHaxhy : A Cheap an-1 Simple Micro-balance.— J. W. T. Walsh : 



The Resolution of a Curve into a Numher of Exponential.'^. 

 In5;titution of Mechanical Engineers, at 6. — Dr. E. Hopkinson : 



Presidential Address. 



TUESDAY, October 28. 

 WiREi.Fss Society of London (at Institution of Civil Engineers), a: 6. — 

 General Meeting. 



WEDNRSDA V, October 29. 

 RovAL Afronauticai. Society (at Royal Society of Arts), at 8.— Sir 

 Horace Darwin : 'J he Static Head Turn Indicator for Aeroplanes. 



CONTENTS p.^GE 



Facts and Factors of Evolution. ByJ. A. T. . . . 149 



American Universities. By C. E. M 151 



Our Bookshelf 152 



Letters to the Editor: — 



The Doubly Refracting Structure of Silica Glass, — 



Right Hon. Lord Rayleigh, F. R.S. . 153 



A Search for Fine Wool.— Prof. J. C. Ewart, F.R.S. 153 

 Radiation Temperatures. — Spencer Pickering, 



F.R.S 15J 



Time Relations in a Dream. — Joseph Barcroft, 



C.B.E., F.R.S. 154 



International Relations in Science — Prof. D'Arcy 



W. Thompson, C.B., F.R.S 154 



International Organisation in Science 154 



Evolution of Ostrich Plumes 155 



Education in India 156 



Notes .... 157 



Our Astronomical Column : — 



Nova; 160 



The Sun-spot Curve 160 



Solar Radiation 160 



New Sources of Aluminium in Norway. By L. 



Hawkes 160 



Hydro-electric Development Works. By Dr. 



Brysson Cunningham i^ii 



The British Association at Bournemouth : — 



Section F — Economic Science and Statistics — Opening 

 Address (Abridged) by Sir Hugh Bell, Bart., 



D.L., J. P., President of the Section 162 



Forthcoming Books of Science 166 



University and Educational Intelligence . ... 167 



Societies and Academies . . . 167 



Books Received ... . . 168 



Diary of Societies . . . 168 



Editorial and Publishing Offices : 



MACMILLAN AND CO., Ltd., 



ST. MARTIN'S STREET, LONDON, W.C.2. 



Advertisements and business letters to be addressed to the 

 Publishers. 



Editorial Communications to the Editor. 

 Telegraphic Address : Piiusis, LosnON. 

 Telephone Nu.mber : Gfrrard 8830. 



