456 



NA TURE 



[March 13, 1902 



concentration of the solution. Observations are given showing 

 that this principle does not completely express the actual 

 phenomena. — Volume in urology, by M. J. Winter. — The 

 employment of the electric arc in iron in phototherapy, by MM. 

 .Andre Hroca and Alfred Chatin. — PadiypoJitiiii h'tileiihergiaiiiiin, 

 a Madagascan textile plant, by M. Henri Jumelle. — On some 

 rocky veins which traverse the dunile ground mass of Koswinsky, 

 by M. L. Duparc. 



DIARY OF SOCIETIES. 



THURSDAY, March 13. 



Royal Society, at 4.30. — Croonian Lecture, on Certain Chemical and 

 Physical Properties of Ha-moglobin : Prof. A. Gamgee, F.R.S. 



Institution op Electrical HIngineers, at 8. — Adjourned discussion 

 on the following papers :— Electric Shock and Legislation thereon: 

 Major-General C. K. Webber, C.B., RE.— Electric Shocks: F. B. 

 Aspinall. — Electric Shocks at 500 volts : A. P. Trotter. 



Mathematical Society, at 5.30. — The Theory of Cauchy's Principal 

 values (ML): Mr. G H. Hardy.— The Solutions of a System of Linear 

 Congruences: Rev, J. Cullen.— Algebraical Connection between Zonal 

 Harmonics of Orders differing by an Integer: R. Hargreaves.— On 

 Quadrature Kormulai : J. Buchanan. 



Society of Arts (Indian Section), 314.30. — The Indian Famine of 1899, 

 and the Measures taken to meet It : T. W. Holderness. 



FRIDAY, March 14. 



'TlovAL Institution, at 9. — Magnetism in Transitu: Prof. S. P. 

 Thompson, F.R.S. » 



Royal Astronomical Society, at 5.— Note on the Green Flash : T. W. 

 Backhouse.— The Fl.-ish Spectrum, Sumatra Eclipse, igot : S. A. 

 Mitchell. -Observations of Nova Cygni (1S76) made with the 40-inch 

 Refractor of the Yerkes Observatory : E. E. Barnard. -Anomalous 

 Occultations of Stars by the Mocn : G. W. Hough.— The Duralion of 

 Totality at Naval-mor.al, 1900 : C. T. Whitmell.—Note on Prof. Turner's 

 Recent Paper on Photographic Surveying: H. G. Fourcade.— The 

 Magnitude of ij-Argus, 1000-190=: R. T A. Lines.— On the Variation of 

 S. Carin^E : A. W. Roherts.-5 4^4 and 485, and two pairs : Rev. T. E. 

 Espin.— Double Star Observations. 1899-1901 : W. H. Maw. — New 

 Variable Stars found during the Measurements for the Astrographic 

 Catalogue: Royal Observatory, Greenwich. — Results of Micrometer 

 Measures of Double Sl.irs made with the 23-inch refractor : 

 Royal Observatory, Greenwich. — Promised papers. — Mean Areas and 

 Heliographic Latitudes of Sun-spots in the Year 1901 : Royal Observa- 

 tory, Greenwich.— Proper Motion of Nova Pcrsei : Royal Observatory, 

 Greenwich.— On the Images formed by a Parabolic Mirror. First 

 paper :— The Geometrical Theory : H. C. Plummer. 

 Malacological Society, at 8. 



Institution of Civil Engineers, at 8.— The Use of Long Steel Wires 

 in Surveying : H. J. Deane. 



, Physical Society, at 5.— The Thermal Expansion of Porcelain: A. E. 

 Tutton, F.R.S —On the Temperature Variation of the Electrical Resist- 

 ance of Pure Metals, and Allied Matters: W. Williams.- A Suspected 

 Case of the Electrical Resonance of Minute Metal Particles for Light 

 Waves. A New Type of Absorption : Prof. R. W. Wood. 



SATURDAY, March 15. 

 "nRoyal Institution, at 3. — Some Electrical Developments: Lord Ray- 

 leigh, F.R.S. 



MONDA Y, March 17. 

 VicTOBiA Institute, at 4.30.— Adaptation and Selection in Nature, and 



their Bearing on the Evidence of Design ; Dr. VV. Kidd. 

 SociETVOF Arts, at 8.~Photography applied to Illustration and Printing : 

 I. D. Geddes. 



TUESDAY, Uakch ji. 

 ■Royal Institution, at 3. — Recent Researches on Protective Resem- 

 blance, Warning Colours and Mimicry in Insects : Prof. E. B. Poulton, 

 F.R.S. 

 Institution of Civil Engineers, at 3. — Paper to be further discussed', 

 —Electrical Traction on Railways: W. M. Mordey and B. M. Jenkin. 

 Papers will be read :— The Green.>'ich Footway-Tunnel : W. Copper- 

 thwaite.— Subaqueous Tunnelling through ihe Thames Gravel, Baker 

 Street and Waterloo Railway : A. H. Hai^h. 

 Zoological Society, at 8. 30.— The Evolution of Horns and Antlers: Dr. 

 Hans Gadow, F.R.S.— Notes on the Transformations of some South- 

 .\frican Lepidoptera : Lt.-Col. J. M. Fawcett.— On a new Stridulating- 

 Organ in a Scorpion : R. I. Pocock. 

 Royal Statistical Society, at 5. 



WEDNESDAY, March 19. 

 Chemical Society, at 5.30.— The Absorption Specira of Metallic 

 Nitrates, Part I. : W. N. Hartley. — A Method of Determining the 

 Ratio of Distribution of a B.-ise between Two Acids: H. M. Dawson 

 and F. E. Grant.— On the M'.lecular Complexity of Acetic Acid in 

 Chloroform Solution : H. M. Dawson. -On the Existenceof PoUiodides 

 in Nitrobenzene Solution: H. M. Dawsin and R. Gawler. — Nitrogen 

 Chlorides containing the Pr.ipionyl Gioups : F. D Chaitaw.-iy — Deriva- 

 tives of <i-Aminocamphoroxime : .■\. Lapworth and A. W. Harvey.— 

 Pr*-paration of Sulphamide from Ammonium Amidosulphite : E. Divers 

 and M. Ogawa. — Hypoiodous Acid : R. L. Taylor, 



Soi IF . V OP Arts, at 8.- Electric Traction. London's Tubes, Trams, and 

 Trains: J. C. Robinson. 



RovAl, MlcnoscorlCAL Society, at 7.30,— Exhibition of Foraminifera : 

 A, Earland, 



Entomological Society, at 8. — Notes on Some Cases of Seasonal 

 Dimorphism in Butterflies : with an Account of Experiments made by 

 Mr, Guy A, K. Marshall : Dr, F, A, Dixey,-Mimicry illustrated by the 

 Sanger Shepherd Three Colour Process : Prof, E, B, Poulton, F,R,S. 



RovAL METEORoLnciCAL SociETY, at 7,io, — La l.une mange lesNuagef. 



A Note on the Thermal Relations of Floating Clouds : W, N, Sbaw, 



F R.S,— The Prevalence of Gales on the Coasts of the British Islands 



during the Thirty Years 1871 t9<o : F. J, Brodie, 



THURSDAY, March 10. 



Royal Society, at ^.t,o.—I^robabte papers :— Development of the Layers 

 of the Retina in the Chic;k after the Formation of the Optic Cup : J, 

 Cameron —On a Peculiarity of the Cerebral Commissures in certain 

 Marsupialia, not hitherto recognised as a Distinctive Feature of the 

 Diprotodontia : Prof. G. Elliot Smith.— The Classification of the 

 Elements: Prof. H. E, Armstrong. F.R.S,— On a Throw-Testing 

 Machine for Reversals of Mean Stress : Prof. Osborne Reynolds, F.R.S., 

 and J. H. Smith.— On the Equilibrium of Rotating Liquid Cylinders: 

 J. H. Jeans.— A Portable Telemeter, or Range-finder : Prof. G. Forbes, 

 F.R.S. 



LlNNEAN Society, at 8.— Electric Response in Orilinary Plants under 

 Mechanical Stimulus : Prof. J. C. Bose.— On the Fruit of Melocarina 

 baiubusoidcs, Trin., an Exalbuminous Grass: Dr. O. Stapf.— On 

 Malacostraca from the Red Sea Collected by Dr. H. O, Forbes : Messrs, 

 Alfred O, Walker and Andrew Scott. 



Institution of Electrical Engineers, at 8. — Problems of Electric 

 Railways: J. Swinburne and W. R, Cooper, 



FRIDAY, March si. 



Royal Institution, at 9 —Recent Developments in Colouring Matters, 

 (In English) : Prof, Otto N. Witt, 



Institution of Mechanical Engineers, at 8, -Fencing of Steam and 

 Gas-Engines: H. D. Marshall,- Fencing or Gu.arding Machinery used 

 in Textile Factories : S. R. Piatt.— Protection of Lift-shafts, and Safety 

 Devices in connection with Lift-Doors and Controlling Gear: H. C. 

 Walker.— Guarding Machine Tools : W. H. Johnson. 



EriDEMioLOGicAL SociETY, at 8.30— Infantile Motlnlity in the Tropics 

 Dr. Daniels. 



SATURDAY, March 22. 



Royal Institution, at 3.— Some Electrical Developments : Lord Ray- 

 leigh, F.R.S. 



Essex Field CLun(Essex Museum of Natuial History, Stratford), at 

 6.30.- Annual Meeting. The Presidential Address will be delivered by 

 Prof. Meldola, F.R.S., on The Coming of Age of the Essex Field Club, 

 a Record of Local Scientific Work, 1880-1901. 



NO. 1689, VOL. 65] 



CONTENTS. PAGE 



A New Manual of the Protozoa. By E. AM. . . 433 



Greek Topography in Relation to History .... 434 



Geometry on the Sphere. By A. L 435 



A Consul in China 43^ 



Our Book Shelf:— 



Hetrick : " The Home-Lifeof Wild Birds.'— R. L. . 437 



Brown: " Finishing the Negative " 437 



Laurie : " Text-book of Elementary Botany ' ... 437 



Thomas: " Intuitive Suggestion." — A. E. T, , . . 438 



Meyer : " Jahrbuch der (ihemie." — A. S 438 



Letters to the Editor : — 



Earthquake Observations in Strassburg.— Prof, John 



Milne, F,R,S 438 



Prools of Euclid I. 5.— Prof, G, H, Bryan, F.R.S. 438 

 The Zodiacal Light and Sun rillars,— Rev. Guy J. 



Bridges ; Wm, A. Knight 439 



The (Juadrantid Meteors.— T. W. Backhouse . . 439 

 Elementary Mathematics.— Dr. Waldemar Ler- 



mantoff 439 



The Native Question in South Africa 440 



The Jubilee of the Austrian Meteorological Central- 



anstalt. Hy 'W. J S. L 440 



The Owens College Jubilee 44' 



Notes, (Illustrated) 442 



Our Astronomical Column : — 



New Annual Ttriii in the Variation nf Latitude . , , 446 



Observations of Jufiter. Hy W, F, Denning , , , 446 

 Magic Squares and other Problems upon a Chess- 

 Board, (Wtlh Diagrams.) By Major P. A. Mac- 



Mahon, F.R.S. . ' 447 



Forthcoming Books of Science 45^ 



University and Educational Intelligence 454 



Societies and Academies 454 



Diary of Societies 45^ 



Suri'LEMENT. 



The Present Judged by the Future, By Prof. 



E, Ray Lankester, F,R,S iij 



Motor Vehicles ^'' 



The Stellar Universe. By Prof, R, A, Gregory viii 



Principles of Geography " 



Elementary Zoology " 



