April 15, 1920] 



NATURE 



219 



Abelian bodies of the first degree. — H. Villat : The 

 variable movement of an indefinite fluid with stream- 

 lines in presence of a solid body. — R. Thiry : A 

 problem of hydrodynamics admitting an infinity of 

 solutions. — K. Belot : Dichotomic classification of all 

 stars with the hypothesis of their formation by cosmic 

 shock.— Ad. Braiy : A new, simjile, and rapid method 

 for collecting and characterising the sublimates pro- 

 duced by metalloids and metals volatilised by the 

 blowpipe. Two flames are used, alcohol and paraffin, 

 to secure different temperatures of volatilisation, and 

 the sublimates are received on clear mica sheets. ^ — 

 O. Mengel : Two ancient lines of beach at Roussillon : 

 their relations with two Glacial periods. — H. Hubert : 

 Granitic rocks associated with the diabases of the 

 Douale massif (Haut-Sen^£?al and Niger). ^ — J. Rouch : 

 The height of sea-waves. The Richard statoscop^ was 

 used in these measurements; i mm. on the scale of 

 the instrument corresponded to about 0-5 metre varia- 

 tion in height. The greatest wave-heights were 

 observed on January 28. 19 10, and gave numerous 

 waves between 4 and 5 metres, fortv above 

 6 metres, twentv above 7 metres, nine above 8 metres, 

 five abov'e q metres, and one of lo-.:; metres. 

 Waves of a greater height than 10 metres are rare 

 in the -Atlantic and the southern seas. — P. Bugnon : 

 The origin of the transverse liberoligneous bundles 

 forming a network at the nodes of the Grnmineae. — 

 F. Morvlllez : The liberoligneous apparatus of the leaves 

 of Betulaceae, Corylaceae, and Castaneaceae. — L. 

 Blaringhem : Thf' production by traumatism of a new 

 form of maize, 7.ea Mays. var. polyspcrma.- — J- Barlot : 

 The determination of poisonous varieties of Amanita 

 hv colour reactions. The colour reactions of numerous 

 fun!?i with sulphuric acid and potash solution are 

 detailed. Three ^'erv poisonous varieties gjye a posi- 

 tive " haemo-reaction " with a mixture of fresh blood 

 and potassium ferricvanide. — R. Cambier : The puri- 

 fication of sewage bv activated sludge. 



Books Received. 



A Text-book of Inorganic Chemistrv. Vol. ix. 

 Part i. Bv Dr. T. Newton Friend. Pp. xvii + 367. 

 (London : C. Grifiin and Co., Ltd.) i8s. 



Grundziige der svstematischen Petrographie auf 

 genetischer Grundlage. Bv Dr. W. Hommel. Erster 

 Band: Das System. Pp. xii+ 174 + 5 Tafel. (Berlin: 

 Gebriider Borntraeger.) 22 marks. 



Mrs. Warren's Daughter. By Sir Harry Johnston. 

 Pp. xi + 402. (London: Chatto and Windus.) 7s. 6d. 

 net. 



Recent Developments in Eurooean Thought. Edited 

 by F. S. Marvin. Pp. 306. (London : Oxford L^ni- 

 versitv Press.) 125. 6d. net. 



.\ Junior Course of Practical Zoologv. Bv the late 

 Prof. A. M. Marshall and Dr. C. H.' Hurst. Ninth 

 edition. Revised bv Prof. F. W. Gamble. Pp. 

 xxxvi + .i;i7. (London : J. Murrav.) i2,v. net. 



Lectures on the Theory of Plane Curves. Bv 

 S. Ganguli. Part i. Pp. x+138. Part ii. Pp. xiii + 

 i3q-3ro+di#grams. (Calcutta": l^niversitv "of Cal- 

 cutta. 1 



-Applied .Aerodynamics, By G. P. Thomson. Pp. 

 xx + 2q2. (London: Plodder and Stoughton, Ltd.) 

 42."f. net. 



On the Interpretation of Phenomena of Phvllotaxis. 

 (Botanical Memoirs. No. 6.) Bv .A. H. Church.' Pp. 58. 

 (London : Oxford l^^niversity Press.) is. 6d. net. 



Half-nnst Twelve : Dinner Hour .Studies for the 

 Odd Half-Hours. Bv G. W. Gough. Pp. vi + 77. 

 (London : Sells. Ltd.) js. 



I'tilisation des Algues Marines. By Prof. C. 

 NO. 2633, VOL. 105] 



Sauvageau. Pp. vi+3g4. (Paris : O, Doin.) 

 3.50 francs. 



Results of Meridian Observations of Stars made at 

 the Royal Observatory, Cape of Good Hope, in the 

 Years 1909-1911. Ppp.xx + 206. (London : H. M.S. O.) 

 20i. net. 



Fundamental Catalogue of 1293 Stars for the 

 Equinox 1900 from Observations made at the Royal 

 Observatory, Cape of Good Hope, during the Years- 

 1905-1911. Pp.xlvi + 27. (Edinburgh : H. M.S. O.) 5s. 



Cape Astrographic Zones. Vol. iii. Catalogue of 

 Rectangular Co-ordinates and Diameters of Star- 

 Images derived from Photogriiphs taken at the Royal 

 Observatory, Cape of Good Hope. Zone 43°. Pp. 

 xxxvii + 443' (Edinburgh: H.M.S.O.) 155. 



-Annals of the Cape Observatory. Vol, viii. Part iv. 

 Results of Meridian Observations of the Sun, Mer- 

 cury, and Venus made at the Royal Observatory, Cape 

 of Good Hooe, in the Years 1907 to 1914. Pp. 93. 

 (Edinburgh:' H.M.S.O.) 3s. 



The Use of Low-Grade and Waste Fuels for Power 

 Generation. By J. B. C. Kershaw, Pp. x+202. 

 (London : Constable and Co., Ltd.) 17s, net. 



Colloids in Biology and Medicine. By Prof. H. 

 Bechhold. Translated, with Notes and Emendations^ 

 by Prof. J. G. M. BuUowa. Pp. xiv + 464. (London: 

 Constable and Co., Ltd.) 3i.'>. 6d. net. 



Bvgone Beliefs : Being a Series of Excursions irr 

 the Byways of Thought. By H. S. Redgrove. Pp. 

 xvi-f-205 + 32 plates. (London : W. Rider and Son, 

 Ltd.) lo.f. 6d. net. 



Macmillan's Graphic Geoi*raphies : The British 

 Empire. By B. C. Wallis. Pp. 32, (London : Mac- 

 millan and Co., Ltd.) js. 6d. 



The Nurserv-Manual : A Complete Guide to the 

 Multiplication of Plants. By L. H. Bailey. Pp. xi + 

 456 + xii plates. (New York: The Macmillan Co.; 

 London : Macmillan and Co., Ltd.) 13s. net. 



-A Theory of the Mechanism of Survival : The 

 Fourth Dimension and its .Applications. By W. W. 

 Smith. Po. 196. (London : Kegan Paul and Co., 

 Ltd.) 5s. net. 



Roses : Their History. Development, and Cultiva- 

 tion, By Rev, I, H. Pemberton. Second edition. 

 Pp. xxiv-l-334. (London : Longmans and Co.) 155-, 

 net. 



A Short Course in College Mathematics. By Prof. 

 R. E. Moritz. Pp. ix + 2i6. (New York: The Mac- 

 millan Co. ; London : Macmillan and Co., Ltd.) 

 To.v, 6d. net. 



Diary of Societies. 



THURSDAY, tifHii. It,. 



RoYAi. Instiiution of Great Britain, at 3.— S. Skinner: Ebullition 

 and Evaooration. 



Royal Society ok Arts (Indian Section^ at 4.30— Sir George C. 

 Buchanan: The Ports of India : Their Administration and Development. 



LiNNEAN Society, at 5.— Capt. F. Kinedon Ward : Natural History 

 Exploration on the North-east Fronti'r of Rurmi.— R. Paulson: 

 Exhibition of I antern-slidesiUustrating Definite Stages in the Sporulation 

 and Gonidia within the Thallus of the Lichen Evern'a prunastri, Ach. 



Royal Society of Medicine (Dermatology Section), at 5. 



Institution of Mining and Metallurgy (Annual General Meeting/ 

 (at Geological .Society), at 5.30. — F. Merricks : The Mineral Production 

 of the Kmpire (Presidential Address). 



Child-Study Society (at Royal Sanitary Institute), at 6.— Prof. W. 

 Ripman : Spelling Reform. . t r>- •\ 



Institution of Electrical Engineers (at Institution of Civil 

 Engineers), at f.— Dr. C. V. Drysdale : Modern Marine Problems 

 (Kelvin Lecture). ». . . 



Optical Society (at Imperial Colleec of Science and Technology), 

 at 7.30.— J. Weir French: The Unaided Eye, Part III.-R. R 

 Walls : The Rock Crystal of Brazil. 



Chemical Society, at S.— I. Masson .ind R. McCall : The Viscosity o 

 Nitrocellulose in Mixtures of Acetone and Water.— S. S. Bhatnagai : 

 Studies in Emulsion. Part I. A New Method for Determining Inversion. 

 — W. H. Gibson and R. .McCall : (i) Th- Influence of Nitroglycerine on 

 the Viscosilv of Solutions of Nitrocellulose in Kther-alcohol.^ (i) The 

 Viscosity of Solutions of Nitrocellulose in Ether-alcohol— W. K. Slater: 

 Experiments on the Preparation of Isonitro'O-derivatives.— C. S. Salmon: 

 Direct Kxperimental Determination of ihe Concentration of Potassium and 

 Sodium Ions in Soap Solutions and Gels.— W. C. McC. Lewis : Studies 



