312 



NATURE, 



[January 30, 1902 



up of acetylene burners. — On the tribromo- and triiododinaphth- 

 oxanthonium and on the hydrobromic, dibromo-, and 

 hydriodic diiodo-ethers of the supposed binaphthylene glycol, 

 by M. R. Kosse. — On the action of the mono-halo(;cn (iriipionic 

 esters upon the sodium derivative of acetyl-acetone, by M. l'"r. 

 March. — Contributions to the study of the chemical modifica- 

 tions in plants submitted to the influence of sodium chloride, 

 by MM. E. Charabot and A. Hebert. The addition of 

 common salt to the soil has the following effects : it 

 increases the percentage of organic matter in the 

 plant, and also increases the relative loss of water. 

 At the same time that this double influence is exerted on the 

 plant, the sodium chloride favours esterification and reduces 

 the transformation of menthol into nienthane. — The biological 

 theory of vision, by M. Georges Bohn. A criticism of the 

 theory of vision put forward by M. Pizon. Of the three 

 essential ideas of this theory, M. Bohn regards the first as not 

 new and the two latter as not true. — The elementary forms of 

 phosphorus in the invertebrates, by M. Jean Gautrelet. In the 

 blood, carapace and shells of Crustacea and molluscs, phosphorus 

 exists in two elementary forms, miner.al and organic. — The utili- 

 sation of sugars by the organism, by MM. Charrin and Brocard. 

 — On the assimilation of sugar and of alcohol by Eurolyopsis 

 Gayoni, by M. 1'. Maze The analytical results quoted would 

 tend to show that the mycelium of this fungus is capable of 

 utilising both alcohol and ammonia without loss of material. — 

 The indications of the prophylaxy and treatment of pulmonary 

 tuberculosis, by MM. Albert Robin and Maurice Binet. — On 

 the origin of certain diseases of chrysanthemums, by M. Chifflot. 

 Two diseases of the chrysanthemum described by M. Jofl'rin as 

 new have been well known for some time both to botanists and 

 horticulturists. — The siliceous tufa of dte-aux-Buis, atGrignon, 

 by M. Stanislas Meunier, — On the appearance of lesions in a 

 foal analogous to those produced in its mother by an accident, 

 by M. Le Hello. 



DIARY OF SOCIETIES. 



THURSDAY, January 30. 

 Royal Society, at 4.^0. — The Chemical Oiigins of the Lines in Nova 



Persei: Sir Norman I.ockyer, K.C.B., F.R.S.— The Specific Volume's of 



Oxygen and Nitrogen V.ipour at ihe Boiling Point of Oxygen : Prof. 



J. Dewar, F.R.S.— The l)i.<tribution of Magnetism as affected by 



Induced Currents in an Iron Cylinder when rotated in a Magnetic 



Field : Prof. E. Wilson 

 JlovAL Institution, at 3.— Recent Excavations at Delphi and in the 



Greek Islands : Dr. A. S. Murray. 



FRTDA V, January 3.. 

 •Royal Institution, at g. — The Ions of Electrolysis: Prof. A. Crum 



Brown, F.R.S. 

 Institution of Cn'ii. Engineers, at 8.— The Quay-Walls of Keysham 



Harbour : J. C. Collelt and W. H. C. Clay. 

 'Institution of Mechanical Engineeks, at 8.-Discus.sion of the 



Paper by Mr. H. K. L. Orcutt, on Modern Workshop Methods 



MONDAY, Feiikuary 3. 

 Society of Arts, at 8. — The Purification and Sterilisation of Water : Dr. 



Samuel Rideal. 

 Imperiai. Institute, at 8.30.— The Native Races of Nigeria: Dr. C. F. 



Harford-Batlersby. 

 Society OF Chemical Industry, at 8.— The Explosion of Potassium 



Chlorale by Heat : Dr. A. Dupri, F R S.— The New Table Photometer 



and Standard Pentane Burner prescribed by the Gas Referees for use in 



the London Gas-testing Stations : Dr. F. Clowes. 



TUESDA Y. FEnRUARV 4. 



Royal Institution, at 3. — The Cell: its Means of Offence and Defence : 

 Dr. A. Macfadyen. 



Society of Arts, at 4.30.— The History of the Rosary in all Countries: 



Rev. Herbert Thuist.in, S.J. 

 Zoological Society, at 8.30. — Ecdysis.as Morphological Evidence of the 

 OriginalTetradactyle Feathering of the Bird's Fore-limb: Edward Degen. 

 — A Revision of the Amblypodia-Group of the Lycaenidae: G. T. Bethune- 

 Baker.— Notes on the Osteology of Cogi.i brcficcfs: Prof. W. Blaxland 

 Benham 



Institution of Civil Engineers, at 8. — Paf'erstc hefttrtherdiscussed: 

 The Sewerage Systems of Sydney, N.S.W., and its Suburbs: J. Davis.— 

 The B.iclerial Treatment of Trades Waste : W. Navlor. 



MiN^KM.o.lCAL Society, at 8. -On the Hornsilvers : G. T. Prior and 

 L. J. Spencer.— The Idenlitv of Kilbrickenite with Geocronite : .-\nalyses 

 of Miersite. Marshite and Copper-Pyrites: G. T. Prior.— A New 

 Sapphirine-like Miner.al from Ceylon : G. T Prior and A. K. Coomara- 

 Swamy. — Attempts to reproduce Interference-Effects by Three-Colour- 

 Printing : Prof. Miers. 



WEDNESDA Y, February 5. 



Society of Arts, at 8.- Jamaica : Herbert T. Thomas. 



Geological Society, at 8.- On the Matrix of the Suffolk Chalky 

 Boulder-Clay : Rev. Edwin Hill.— On the Relation of certain Breccias to 



the Physical Geogr-aphy of their Age: Prof. T. G. Bonney, F.R.S.— 



On some Gaps in the Lias : E. A. Walford. 

 Entomological Society, at 8. 

 SocietyofPublicAnalysts. at 8. 



THURSDA Y, Fedkuarv 6. 



Royal Socibtv, at 4.30. 



Society of Arts, at 4.50.— The Coal Resources of India : Prof. 

 W. R. Dunslan, F.R.S. 



Linnean Society, at 8.— On a Method of Inveslig.iling the Gravilalional 

 Sensitiveness of the Root-tip: F. Darwin, F.R.S.— An Extinct Family 

 of Ferns: Dr. D. H. Scolt, F.R.S. 



Chemical Society, at 8. — An Investigation into the Composition of 

 Brittle Platinum: W.N Hartley.— Conversion of /-Hydroxycamphene 

 intoP-Halogen Derivatives of Camphor : M. O. Korsler.- Telrazoline, 

 Part II. : S. Ruhemann and H E. Stapleton -(i) The Solubilities of 

 the Calcium Salts of ihe Acids of the Acetic Acid Series ; (2) The Equi- 

 librium between a Solid and its Saturated Solution at various Tempera- 

 tures : J. S. Lumsden. — The Influence of Temperature on Association in 

 Benzene Solution, and the Value of the MoIecuLar Rise of Boiling Point 

 for Benzene at Different Temperatures: W. li Innes— The Magnetic 

 Rotation of Ring Compounds ; Camphor. Limonene, Carvene, Pinene, 

 and some of their Derivatives: W. H. Pferkig. sen., F.R.S. -Polymerisa- 

 tion Products from Diazoacetic Ester : O. Silberrad. 



Rontgen Society, at 8.30. — A System of Radiography: E. W. H. 

 Shenton. 



FRIDA V, February 7. 



Royal Institution, al 9. — The New Mammal from Central .Africa and 

 other (;iraffe-like Animals : Prof E. Ray Lankesler, F.R.S. 



Geologists' Association, at 7-30.— Annual General Meeting.- Address 

 on a D >/en Years of London Geology (Eocene, Chalk, and Underground) : 

 W. Wbitaker, F.R.S., President. 



CONTENTS PAGH 



The Advancement of Natural Knowledge .... 2S9 



The Eiffel Tower 291 



Voigt's Elementary Mechanics. By A. E. H. L. . 293 



Essays on Bird-Life. By R. L 294 



Our Book Shelf:— 



Ball: " The Earth's Beginning" 294 



Newstead : " Monograph of the Coccida; of the 



British Isles" 295 



Larbaletrier : " Le Sel, les Salines et les Marais 



Salants."— T. S. D. 295 



Parsons : " Elementary Ophthalmic Optics, including 



Ophthalmoscopy and Retinoscopy" 295 



Gamble: " The Process Year Book, 1901-2" . . . 296 



Colvin : " Nautical Astronomy " 296 



Martin: " Elementary Chemical Theory " 296 



Letters to the Editor : — 



Cherry Disease.— Sir W. T. Thiselton-Dyer, 



K.C.M.G., F.R.S 296 



Variation in Fowls. — F. Finn 297 



Elementary School Mathematics.— J. W. Marshall 297 

 The Distance of Nova Persei.— W. E. 'Wilson, 



F.R.S 298 



A Luminous Centipede.— J. E. Barnard 299 



Birds Capturing Butterflies in Flight. — Lilian J. 



Veley 299 



Extremes of Climate in the British Empire —Chas. 



A. Silberrad 299 



A Gallery of Animal Engravings of the Stone Age. 



(IlluitraUd.) Hy A. C. H 299 



The University of London 300 



Notes 301 



Our Astronomical Column : — 



.'Vstronomical (Occurrences in February 305 



Variability of the Satellites of Saturn 305 



Magnetic Observations during Total Solar Eclipse . 305 

 Simultaneous Visibility of Sun and Total Lunar 



Eclipse 305 



The Validity of the lonisation Theory. By W. R. C. 305 



An Italian Electric Railway 308 



University and Educational Intelligence 308 



Societies and Academies 3°? 



Diary of Societies 3'2 



NO. 1683, VOL. 65] 



