NATURE 



[September 2, 1920 



Capk I'OWN. 

 Royal Society ol South Africa, July 21.- Dr. A. Og}<, 

 vite-presidt-nt, in tho ihair. — P. A. van der Bijl : j tie 

 genus Tulostoma, I'ersoon, in South Africa. I'his is 

 a widely distributed gt-nus, and in South Africa 

 two species are thus far known, viz. Tulostoma 

 cyclopnorum and T. Lesldei, a new sjx'cies, which 

 the author describes in this paper. — P. A. van der 

 Bijl : A fungus, Ovulariopsis papayae, n.sp., which 

 causes jxjwdery mildew on the leaves of the pawpaw 

 plant {Carica papaya, Linn.). The author describes 

 a fungus found in Natal on the under-surface of the 

 pawpaw leaves as a new species, for which the name 

 Ovulariopsis papayae is suggested. — P. A. van der 

 Bijl : South African Xylarias occurring around Dur- 

 ban, Natal. Four species of Xylarias have thus far 

 been collected by the writer around Durban, and of 

 these three have not been previously recorded from 

 South Africa. — W. A. Jolly : Note on the spinal 

 reactions of the Platana. . The author gives a note 

 of reflex times observed in the spinal preparation of 

 the Platana of the Cape Peninsula {Xenopus laevis or 

 an allied species). — J. R. Sutton : A possible lunar 

 influence upon the velocity of the wind at Kimberley 

 (third paper). This pap>er deals with the variations 

 in the speed of the wind when the moon is furthest 

 from the earth. The discussion follows the same 

 lines as the previous one, which dealt with the speed 

 variations at perigee. The results obtained go to 

 confirm the earlier ones. The diagram curves show 

 generally the same turning-points as the perigee 

 curves, but later in time, and the moonrise minimum 

 is not so pronounced. The apogee curves average 

 lower on the scale than the perigee curves. While the 

 velocity of the wind tends to rise at perigee when 

 the moon is above the horizon, it tends to fall at 

 apogee. 



Sydney. 

 Royal Society of New South Wales, July 7.~Mr. T. H. 

 Houghton, vice-president, in the chair. — Dr. S. 

 Smith : Aphrophyllum Hallense, gen. et sp. nov., and 

 Lithostrotion from the neighbourhood of Bingara, 

 N.S.W. The corals are referred by the author to 

 Lithostrotion arund'neuin and L. Stanvellensc. — 

 J. H. Maiden : I^escriptions of three new species of 

 Eucalyptus. The first is a dwarf, mallee-like stringv- 

 bark, from between Port Jackson and Broken Bay, 

 closely allied to a moderatelv large tree. Eucalyptus 

 capitellata. The second species comes from the sum- 

 mit of Mount Joun.'.ma." at an altitude of about 

 5400 ft., thirty miles south of Tumut. It is a large 

 tree, a gum, and tlie bark falls o(T in strips as much 

 as 30 ft. long. It is allied to the snow gum. Euca- 

 lyptus coriacea. and to one of the mountain ashes, 

 S- giganteci. The third species comes from the drier 

 parts of Western .-Vustralia, and it may be spoken of 

 as the dry country representative of the Yate, 

 E. occidentalis. 



Books Received. 



The Land of the Hills and the Glens : Wild Life in 

 lona and the Inner Hebrides. Bv S. Gordon. Pp. 

 xii + 223. (London :CasseIl and Co., Ltd.) 15s. net. 



Die Binokularen Instrumente. By Prof. M. von 

 Rohr. Zweite .Auflage. Pn. xvii-f303. (Berlin 

 J. .Springer.) 40 marks. 



A Text-book of Electrical Engineering. Translated 

 from the German of Dr. .'\. Thomalen bv Dr. 

 G. W. O. Howe. Fifth edition. (London : E. 

 Arnold.) 28s. net. 



NO. 2653, VOL. 106] 



Einfiihrung (Handbuch der biologischen .\rbeits- 

 methoden). By E. Abderhalden. Pp. 44. (lierlin 

 und Wien : Urban und Schwarzenberg.) 4 marks. 



The .^dvancement of .Science, 1920 : Addressee 

 delivered at the Eighty-<-ighth .•\nnual Meeting of the 

 British Association for the Advancement of Science, 

 Cardiff, .\ugust, 1920. (London : John Murray.) 

 6s. net. 



The .Andes of Southern Peru : (ieographical Kecon- 

 naissancx- along the Seventy-third Meridian. By 

 I. Bowman. Pp. xi4-336. (New York : The Geo- 

 logical Society of New York ; London : Constable and 

 Co., Ltd.) 27^. 6d. net. 



Water-Plants : A Study of Aquatic Angiosperms. 

 By Dr. -Agnes Arber. Pp. xvi + 436. (Cambridge: 

 At the University Press.) 314-. 6i. net. 



A First Course in Nomography. By Dr. S. 

 Brodetsky. Pp. xii-)-i3S- (London: G. Bell and 

 Sons, Ltd.) 10s. net. 



Etude sur le Systime Solaire. Bv Dr. P. Revnaud. 

 Pp. xiv-H83. (Paris : Gauthier-Villars et Cie.) 



The Sea-Shore. Bv W. P. Pvcraft. Pp. vi-t-iie. 

 (London : S.P.C.K.) 4s. 6d. net. 



A First German Course for Science Students. By 

 Profs. H. G. Fiedler and F. E. Sandbach. Pp. x+ 

 99. (London : Oxford University Press.) 4s. 6d. net. 



CONTENTS. 



P.AGE 



The Unity of Science and Religion ........ I 



The Drying Up of South Africa — and the Remedy. 



By Sir H. H. Johnston, G. CM. G., K.C.B 2 



Cernent Manufacture and Testing. Ky Prof. C. H. 



Desch 3 



Psychology, Normal and Subnormal 4 



Three Philosophers. By W. W. B 6 



Our Bookshelf 7 



Letters to the Editor: — 



Colour of the Night Sky. — Right Hon. Lord 



Rayleigh, F.R.S 8 



University Grants. — Sir Gregory Foster; Prof. 



Frtderick Soddy, F.R.S 8 



The ^eparalion of the Isotopes of Chlorine. — D. L. 



Chapman, F.R.S 9 



The Scialchreflex in the Cat — Dr. Walter Kidd 9 



Portraits Wanted.— Rev. S. Graham Brade-Birks . 9 

 The Christian Revelation and Modern Scienc%. Bv 

 the Rev. K. W. Barnes, M.A., Sc.D., F.R.S.', 



Canon of Westminster 10 



The British Association at Cardiff 12 



The Internal Constitution of the Stars, By Prof. 



A. S. Eddington, M.A., M.Sc, F.R.S 14 



Memorial Tributes to Sir Norman Lockyer. By Sir 

 Archibald Geikie, O.M., K.C.B. F.R.S. ; Sir W. T. 

 Thiselton-Dyer, K.C.M.G. ■ Sir T. E. Thorpe, 

 C.B., F.R.S.; Sir William A. Tilden, K.R.S. : 

 Rieht. Hon. Sir Clifford AUbutt, K.C.B., 



F R.S. ; Prof. T. G. Bonney, F.R.S 20 



Notes 26 



Our Astronomical Column : — 



Liverpool University Tidal Institute 30 



Longitude by Aeroplane 30 



Observations with the Photoelectric Cell 30 



Th« Scientific Investigation of the Ocean: Need for 



a New Challenger Expedition 30 



The New Star in Cygnus. By Prof. A. Fowler, 

 F.R.S.; Major William J. S. Lockyer; W. F. 



Denning 32 



Britist) Agriculture during Great War Periods . . 33 



Experimental Cell Studie;. \W R. R. G 34 



University and Educational Intelligence .... 34 



Societies and Academies 34 



Books Received 36 



