96 



NA TURE 



[May 25, 1905 



photographic mefhod it has been found that the effect of 

 Foucault currents is to augment the frequency of the 

 oscillations per second without influencing the number of 

 oscillations in each discharge. Hysteresis destroys the 

 oscillations and diminishes, more or less, the frequency. 

 — A study of the radiographic power of an X-ray tube : 

 S. Turchini. The radiographic effects, as measured by 

 the action on a photographic plate, are found to follow the 

 Same laws as the radioscopic effects, and there is reason 

 to suppose that the radiotherapeutic effects will follow 

 similar laws as regards the relation between efficiency and 

 the length of the equivalent spark. — On the conductivity 

 of the gases from flames : Eugene Bloch. The ions con- 

 tained in the gases given off from a flame, at the end of 

 a time sufficiently long take a mobility of the order of 

 o-oi mm., and hence should be classed as large ions. — On 

 the ionisation and coefficient of magnetisation of aqueous 

 solutions : Georges Meslin. — The properties of pyrrhotine 

 in the magnetic plane : Pierre Weiss. — On the causes of 

 varieties of halation in photographic plates : A. Guebhard. 

 — The triboluminescence of metallic compounds : D. 

 Gernez. The luminous effect observed when certain 

 crystals are broken is not, as has been supposed, essentially 

 a propertv of organic compounds, and a list of seventy-four j 

 inorganic compounds is given in which this effect has been 

 observed. — The properties of some anhydrous chlorides of 

 metals of the rare earths : Camille Matigrnon, Details 

 are given of the crystalline form, colour, density, melting 

 points, heats of solution and formation of the chlorides 

 of lanthanum, praseodymium, neodvmium, and samarium. 

 — On a reaction of rhodium : Pifierua Alvarez. Chlorine, 

 acting on an alkaline solution of a rhodium salt, gives a 

 characteristic blue colour, due to the formation of sodium 

 perrhodatc. — The action of the metal ammoniums on 

 alcohols : a general method for the preparation of the 

 alcoholates : E. Chablay. The alkali ammoniums, acting 

 upon a solution of the anhydrous alcohol in ammonia, give 

 a quantitative yield of the alcoholate. — Propionvlcarbinol 

 and its derivatives : Andre Kling^. — Contribution to the 

 study of the derivatives of benzodihydrofurfurane : A. 

 Guyot and J. Catel. — On metha;moglobin : M. Piettre 

 and .\. Vila. — Researches on the mode of action of philo- 

 catalase ; F. Batelli and Mile. L. Stern. The name 

 philocatalase is given to a ferment which is present in 

 many animal tissues, although without direct action on 

 catalase it possesses the property of protecting the cata- 

 lase against the destructive action of anticatalase. The 

 present paper deals with the mechanism of this reaction. 

 — Researches on the comparative power of adhesion of 

 different copper solutions employed as a remcdv against 

 mildew : E. Chuard and F. Porchet. — On a bacterial 

 ^lecay of cabbage : Georges Delacroix. — The classification 

 and nomenclature of arable earths according to their 



mechanical constitution : H. Lagratu The termination of 



the motor nerves in the striated muscles of man : R. 

 Odier.— On the problem of statical work : Ernest Solvay. 

 —On the overlapping strata in the Piedmont zone : Maurice 

 Lug-eon and Emile Argand.— On an extraordinary halo : 

 M. Pernter. 



DIARY OF SOCIETIES. 



5- 



The Globulins": W. B. 



THURSDAY, M 

 ROVAL SociKTV, at 4.30.— Croonian Lectur 



Hardy, F.R.S. 

 Royal Institution, at 5.— Electro-magnetic Waves : Prof. J. A. Flem 



ng, f.r:s. 



NSTITUTION O 



Measurements 



F.LFcrntcAi. Encivefrs, at 3.— Wireless 

 W. Duddell and [. E. Taylor. 

 FRIDAY, Wi^y -ii. 

 at 9.— The Devilofment of Speclr 



Telegraphy 



RovAL Ir 



Prof. J. W. Eriihl 

 Physical Society (at the N.ition.il Physical Laboratory), at j.jo.-The 



Specific Heat of Iron at Hieh Temperatures: Dr. Hafker.— The 

 t of Small Inductances: Mr. Campbell.— Two New Optical 



Benches : Mr. Selby. 



SATURDAY, M« 

 loYAL Institution at 3.— The Ev.,luli( 

 Society : Dr. J. G. Frazer. 



27. 



of the Kingship in Early 



THURSDAY, June t. 

 ._1nstitution, at ;.— Eleclro-magnetic Waves : Prof J. A. Fie 



Rov 

 F.R.S 



Institution of Min-i-t, F.ngineebs (in the Rooms of the Geological 

 Society), at 1 1 a.m.— The Firine of Babcock Boilers wilh Coke-oven Gases: 

 T. \. Greener.— Compound Winding-engine at Lumpsey Mine: M. R. 



NO 1856, VOL. 72] 



Kirby — Note Supplementary to a Paper on the Electric Driving of 

 Windins-gears : F. Hird.— Electric Winding-engines at the Exhibition 

 of the North of France, Arras, Pas-de-Calais : Ed. LoziS.- The Education 

 of Mining Engineers in the United States: Prof. Howard Eckfeldt.— An 

 Outline of Mining Education in New Zealand : Prof. James Park.— Goaf- 

 blasts in Mines in the Giridih Coal-field, £engal, India: Thomas 

 Adamson, 



LiNNEAN Society, at 8. 



Chemical Society, at 8.— (i) The Constituents of the Seeds of Hydiw- 

 carjius Wightiana and Hydnocarpus Anthclmintica. Isolation of a 

 Homologue of Chaulmoogric Acid. — (2) The Constituents of the Seeds of 

 Gynocardia Odorata : F. B Power and M. Barrowcliff.- The Relation 

 of Ammonium tn the Alkali Metals. A Study of Ammonium Magnesium 

 and Ammonium Zinc Sulphates and Selenales : A. E. H. Tutton.— Cam- 

 phorylazoimide : M. O. For»ter and H. E. Fierz.— Influence of Substitu- 

 tion on the Formation of Diaz gamines and .\minoazo-coinpounds. Part III. 

 Azo-derivatives of the Symmetrically Disubstitutpd Primary Meta- 

 diamines: G. T. Morgan and W. O. Wootton.— Diazo-derivalives of 

 Mono-acylated Aromatic Para-diamines : G. T. Morgan and Miss F. M. 

 G. Micklethwait. — The Significance of Optical Properties as Connoling 

 Structure ; Camphorquinone-hydrazones-oximes ; a Contribution to ihe 

 Chem-stry of Nitrogen : H. E. Armstrong and W. Robertson.- Solubility 

 as a Measure of the Change undergone by Isodynamic Hydrazones. (i) 

 Camphorquinonephenylhydrazone. (2) Acetaldehydephenylhydrazone : W. 

 Robertson.— The Design of Gas-regulators for Theimostats : T. M. 

 I.owry.- The Constitution of Baibaloin. Part I. : H. A. D. Jowelt and 

 C. E. Potter.— Influence of Substitutirn on the Formation of Diazoamines 

 and Aminoaz.T-compounds. Part IV. 5-Bromo-(ii(4,'-r)imethyl-2 ; 4- 

 diamine-toluene : G. T. Morgan and A. Cl.ayton.- The Action of 

 Hypobromous Acid on Piperazine : F. D. Chattaway and W. H. Lewis.— 

 The Action of Magnes'u-n Methyl Iodide on Pinene Niiroso-chloride : 

 W. A. Tilden and J. A. Stokes. -Racemisation Phenomena duiing the 

 Hydrolysis of Optically Active Menthyl and Bromyl Esters by Alkali : 

 A. McKenzie, and H. B. Thompson. 



FRIDAY. June 2. 



Institution OF Mixing ENGiNEEKs(in the Rcoms of the Geological 

 Society), at 10.30 A. m — The Conveyor-systi 

 •as pracii>ed in Great Britain and America 

 Ware. — Underground Fires at the Gr 

 Wales: J. JefiTries.- The Gtology of Chu 

 Sawyer.— Underground Hor,es at an Ind 

 Description of the Eimbeck Duplex Base-lii 



SATURDAY, June 3. 



Royal Institution, at 3.— Exploration in the Philippini 

 Savage Landor. 



Rcoms of the Geolog 

 for filling at the Coal-lace 

 i'. C. Bl.ickelt and R. G. 

 Colliery, New South 

 • Poori, Transvaal : A. R. 

 Colliery: 'l'. Adamso 1.— 

 iar : W. Eimbeck. 



CONTENTS. p.vGE 



The Anopheles Mosquitoes of India. By Dr. J. W. W. 



Stephens 73 



Exercises in Physics 74 



Mathematical Metaphysics 75 



British Minerals. By L. J. S 76 



Our Book Shelf :— 



Dickerson : " Moths and Butterflies" 76 



Stewart : " Seccnd Stage Magnetism and Electricily " 77 

 Tarazona ; '" Memoria sobre el Eclipse Total de Sol del 



dia 30 de Agosto de 1905 " 77 



Otto: " Naluralistische and religiose Wellansicht "- . 77 

 Emch : "An Introduction to Projective Geometry and 



its Applications " 77 



Letters to the Editor: — 



Fictitious Problems in Mathematics. — A. B. Basset, 



F.R.S. ; Dr. E.J. Routh, F.R.S 78 



On the Spontaneous Action of Radioactive Bodies 

 on Gelatin Media. (I/^usO-a/cd.)— John Butler 



Burke 



The Consolidation of the Earth. — Rev. A. Irving . . 

 The Spirit-level as a Seismoscope. —G. T. Bennett . 80 

 A Feather-like Form of Frost. [/lliislraUd.)—H. M. 



Warner 80 



The Evolution of Engraving in the Stone Age. (Illiis- 



tra/eJ.) By A. C. H $[ 



The New Diplodocus Skeleton. {Il/iislraleJ.) .... 82 

 The Masai of East Africa. {Illustrated.) By Sir H. H. 



Johnston, G. CM. G., K.C.B S3 



Notes . ! . ! 84 



Our Astronomical Column : — 



Newly Discovered Ncbulce 89 



The Bruce Telescope Reference Photographs .... 89 

 Twelve Stars wilh Variable Radial Velocities . . . . Sq 



Double " Canals " on Mars in 1903 Sg 



Catalogue of New Double Stars 90 



The Royal Society Conversazione go 



Atmospheric Electricity Observed from Balloons. 



By George C. Simpson 92 



University and Educat on il Intelligence . . . .93 



Societies and Academies g^ 



Diary of Societies 06 



I 



4 



