288 



NA rURE 



[January i8, ic,oo 



in the apparatus described consist of a means of regulating the 

 width of the slit of the shutter, keeping the edges absolutely 

 pArallel, and of moving the plane of the shutter a small deter- 

 minate distance (o'l mm.) from the focal planes. The times of 

 exposure can be varied from 1/40 to 1/5000 of a second ; the 

 photographs with this instrument are very free from fog, and 

 give the true light-values to the objects. — Application of the 

 phase rule to alloys and to rocks, by M. H. Le Chatelier. — On 

 the rhodio-cyanides, by M. E. Leidie. A detailed account is 

 given of the best method of preparing the double cyanide of 

 rhodium and potassium, which has the constitution KBRh2(CN)]2. 

 The crystals are isomorphous with the ferricyanide, cobalti- 

 cyanide, manganicyanide, and chromicyanide of potassium. — 

 New microchemical reactions of copper, by M. Pozzi-Escot. 

 Ammonium iodide is added to the ammoniacal solution of 

 copper salt ; characteristic brownish- black rhomboidal tables 

 are deposited. — On the presence of vanadium, molybdenum 

 and chromium in plants, by M. Eug. Demarcay. — Mechanism 

 of insufficient development in the offspring of diseased mothers, 

 by MM. Charrin, Guillemonat and Levaditi.— On the andesites 

 and basaltites of Cape Marsa, by MM. L. Duparc and F. 

 Pearce. 



DIARY OF SOCIETIES. 



THURSDAY, ]kvvk'r\ \'&. 



.Royal Society, at 4.30. — Upon the Development of the Enamel in 

 certain Osseous Fish: C. S. Tomes, F.R.S. — Further Observations on 

 •' Nitragin " and on the N:iture and Functions of the Nodules of 

 I.eguininous Plants: Miss M. Dawson.— On the Innervation of An- 

 tagonistic Muscles, Sixth Note: Prof. Sherrington, F.R.S. — On the 

 Viscosity of Argon as affected by Temperature : Lord Rayleigh, F.R.S. — 

 - On the Behaviour of the Becquerel and Riintgen Rays in a Magnetic 

 Field: Hon. R. I. Strutt.— On an Kxperimental ^Investigation of the 

 Thermo-dynamical Properties of Superheated Steam by Prof. Osborne 

 Reynolds' Method : J. H. Grindley. 

 /RovAL I.MSTITUTION, at 3 —1 he Senses of Primitive Man : Dr. W. H. R. 

 Rivers. 



SoctETV OF Arts (Indian Section), at 4.30. — Our Workin India in the 

 Nineteenth Century: Sir William Lee- Warner, K C.S.I. 



LiNNEAN Society, at 8. — On the Existence of Nasal Secretory Sacs 

 and of a Nasopharyngeal Communication in the Teleostei : H. M. 

 Kyle.— On the Origin of the Ba^idionycetes : George Massee. 



Chemical Society, at 8. — Nitrogen Halogen Compounds: Julius 

 Steiglitz and E. E. Slosson. — Chlorine Derivatives of Pyridine. Part V. 

 Synthesis of aa'-Dichlorpyridine and Constitution of Citrazinic Acid : W. 

 J. Sell and F. W. Dootson.— Action of Fuming Nitric Acid on a-Dibro- 

 mocamphor : Dr. A. Lapworth and E. M. Chapman. — Electrolysis of 

 Nitrogen Hydrides and of Hydroxylamine : Dr. E. C. Szarvasy. 



FRIDA y, January 19. 

 Royal Institution, at 9. — Flight: Lord Rayleigh. 

 £piDEMiOLOGiCAL Society, at 8.30 —The Utility of the Bacteriological 

 Examination of the Throats of School Children during an Epidemic of 

 ^Diphtheria : K. W. Goadby. — Advantages of Bacteriilogical Diagnosis 

 as instanced by the History of an Outbreak of Diphtheria in a Large 

 School : F. H. Berry. 



MONDAY, January 22. 

 Society of Arts, at 8.— The Nature and Yield of Metalliferous De 



posits : Bennett H. Brough. 

 RovAL Geographical Society, at 8.30. — An Expedition to the Summi 

 of Mount Kenya, British East Africa : H. J. Mackinder. 



TUESDA Y, January 23. 



K.OVAL Institution, at 3.— Structure and Clas.sification of Fishes : Prof. 



E. Ray Lankester. 

 Z ) >', ) ;(C AL Society, at 8.30. — Note on some Remains oK Grypotherittm 

 (Neomylodon^listai zxiA Associated Mammals, from a Cavern near Con- 

 soelo Cove, Last Hope Inlet, Patagonia : A. Smith-Woodwfard — On a 

 Collection of Insects and Arachnids made in 1895 and 1897 in Somali- 

 land, with Descriptions of New Species : C. V. A. Peel and others.— On 

 the Mammals obtained in Southern Abyssinia by Lord Lovat during an 

 Expedition from Berbera to the Blue Nile : W. E. de Winton. 



Miner ALOGiCAL Society, at 8.— Mineralogical Notes : Prof. Miers.— On 

 ihe Constitution of the Mineral Arsenates and Phosphates. Part IV. 

 Beudantite : Mr Hartley.— Petrographical Notes on some Rock-Speci- 

 mens from the Little Island of Trinidad, South Atlantic : Mr Prior. — A 

 New Method of Deriving the Thirty-two Classes of Crystal Symmetry : 

 Mr. Barlow. 



'Institution OF Civil Engineers, at 8. — Swing-Bridges over the River 

 Weaver at Northwich : J. A. Saner. 



'Royal i^kotographic Society, at 8.— Note on Dr. Vogel's Method of 

 Preparing Subhaloid Salts of Silver : Major-General J. Waterhouse. 

 WEDNESDAY, January 24. 



Society of Arts, at 8. — Local Government and its relation to Parish 

 Water Supply and Sewerage : W. O. E. Meade-King 



-Geological Society, at 8. — Contributions to the Geology of British 

 East Africa. Part II. The Geology of Mount Kenya; P.->.rt III. The 

 Elaeolite-Syenite and Fourchites intrusive in the Coast Series : Dr J. 

 W. Gregory. — Fossils in the University Museum, Oxford. II. On Two 

 New Species and Genera of Crinoidea ; III. A New Species of Old- 

 haiina, a Worm-track from the Slates of Bray Head, Irelanl : Prof. W. 

 J. SoUas, F.R.S. 



NO. 1577, VOL. 61] 



THURSDAY, January 25. 



Royal Society, at ^.t,o.— Probable Papers: Mathematical Contribu- 

 tions to the Theory of Evolution — On the Law of Reversion: Prof. K. 

 Pearson, F.R.S. — On the Mechaiiism of Gelation in Reversible Colloidal 

 Systems : W. B.aHardy. — A Preliminary Investigation of the Conditions 

 which determine the Stability of Irreversible Hydrosols : W. B. Hardy. 

 — On the Effects of Strain on the Thermo-electric Qualities of Metals, 

 Part II. : Dr. M. M.aclean.— On the Periodicity in the Electric Touch of 

 Chemical Elements : Prof. J. C. Bose. 



Royal Institution, at 3.— The Senses of Primitive Man: Dr. W. H. 

 R. Rivers. 



Institution OF Electrical Engineers, at 8. — Adjourned Discussion 



on the Report of the Institution's Visit to Switzerland. And if time 



permit : An Electrolytic Centrifugal Process for the Production of Copper 

 Tubes : Sherard Cowper-Coles. 



FRIDA Y, January 26. 



Royal Institution, at g. — Motive Power, High Speed Navigation, 

 Steam Turbines : Hon. C. A. Parsons, F.R.S. 



Physical Society, at 5.— Some Developments in the U.se of Price's 

 Guard Wire in Insulation Tests: Prof. Ayrton and Mr. Mather — Re- 

 flection and Transmission of Electric Waves along Wires : Dr. E. Barton 

 and Mr. L Lownds. — The Frequency of the Transverse Vibrations of a 

 Stretched India-rubber Cord : 'T. J. Barker. 



Institution OF Mechanical Engineers, at 8. — Water Meters of the 

 Present Day, with special reference to Small Flows and Waste >in 

 Dribbles : William Schonheyder. 



Institution of CivilEngineers, at 8.— The Simplon Tunnel : C. B. 

 Fox. 



SATURDAY, January 27. 



Mathematical Association (University College, Gower Street, W.C), 

 at 2. — Dynamical Applications of the Theory of Correspondence : Sir 

 Robert S. Ball.— Triangles Triply in Perspective: J. A. Third.— The 

 Teachingiof. Indices iand Surds: Prof. R. W. Genese. — Illustrations of 

 Pori-smatic Equations: T. J. Bromwich. — A Note 0.1 the Focoids : R. F. 

 Davis. 



CONTENTS. PAGE 



The Principles of Mechanics. By A. E. H. L. . . 265 



The Science of Land Form. By R. A. G 266 



The Reminiscences of A. D. Bartlett. By R. L. . 267 



Electrical Oscillations 268 



Our Book Shelf:— 



Cohn : " Indicators and Test Papers. " — A. S. . 269 

 Landolt : " Optical Activity and Chemical Composi- 

 tion."— J. H. G 269 



Topinard : " Science and Faith " 270 



" Who's Who. 1900 " ; " The Englishwoman's Year- 



Book and Directory. 1900." 270 



Cotton : " Le Phenomene de Zeeman " 270 



Meric : " Dictionnaire des Ternies de Medecine, 



Fran9ais- Anglais " 270 



Letters to the Editor: — 



Contemporary Meteor-Showers of the Leonid and 

 Bielid Meteor- Periods. IL {//hts/rateti.}— Prof. 



A. S. Herschel, F.R.S. . 271 



Is New Zealand a Zoological Region ? — Dr. Alfred] 



R. Wallace, F.R.S ... . . 273 



Molecular Structure of Organised Bodies. {Illus- 

 trated.)— Y. W.Jones 273 



School Science and Knowledge- Making Power. — G. 



H. Wyatt 274 



Echelon Film Gratings.— Charles P. Butler . . . 275 



The Stockholm Fisheries Conference and British 



Fishery Investigations.— E. J. Allen .... 275 



The Representation of the University of London . 275 



Zoologyand the Australian Museums. {Illustrated.) 275 



Floating Stone?. {Illustrated.) By Dr. Erland 



Nordenskiold 278 



Dr. Elliott Coues. By A. N 278 



Notes 279 



Our Astronomical Column: — 



New Minor Planet (1899 E. Y.) 283 



Science Teachers in Conference . . 283 



University and Educational Intelligence 284 



Scientific Serial 285 



Societies and Academies 285 



Diary of societies 288 



