[May 5, 192 1 



, in relation to Beproduction in Coniferous Trees.— Prof. W. J, 

 uakin : X'he Collections from tlie Houtman Abrolhos Islands 



in 1913. „ ^, » u- 



Royal institiite of Bbitish Architects, at 5.— F. C. Eden : Aroni- 



tecture and Travel. 

 CHiLD-oTL'ur SociETi (at Royal Sanitary Institute), at 6.— Miss 



F. K. Webb and Others : Individual Training in the School. 

 Institution of Electbical Engineeks (at Institution of Civil En- 

 gineers), at 6.— Discussion on Tariffs (continuea;. 

 Chemical Societt, at 8.— G. A. R. Kon : The Formation and Stability 

 of »/jt>o-Compounds. Part IV. The Formation of Ketones De- 

 rived from Open-chain and Cyclic Qlutaric Acids by the Thermal 

 Decomposition of their Calcium Salts.— G. W. Monier-Williams : 

 The Hydrolysis of Cotton Cellulose.— J. L. Baker and H. F. E. 

 Hulton : Amylases of the Cereal Grains : Rye. 

 Royal Society of Medicine (Obstetrics and Gynaecology Section), 

 at 8.— Annual General Meeting.— H. Curtis : Angioma of the 

 Vagina Spontaneously Evacuated.— Dr. A. E. Giles and Others : 

 The oauses and Treatment of Sterility. 

 FRIDAY, Mai 6. 

 InoN AND Steel Institute (Annual Meeting) (at Institution of Civil 

 Engineers), at 10 and 2.30.— S. N. Brayshaw : The Prevention of 

 Hardening Cracks, and the Effect of Controlling the Recalesoenoe 

 of a Tungsten Tool Steel.— Dr. J. Newton Friend : The Pro- 

 tection of Iron with Paint against Atmospheric Corrosion.— 

 K. Honda, T. Matsushita, and S. Idei : The Cause of Quenching 

 Cracks.— VV. E. Hughes : Slip-lines and Twinning in Electro- 

 deposited Iron.- A. Westgren : Rontgen Spectrographio Investi- 

 gations of Iron- and Steel.— J. H. Whiteley : Cuprio Etching 

 Effects produced by Phosphonus and Oxygen in Iron. 

 Royal Society of Medicine (Laryngology Section), at 4.45. — Annual 



General Meeting. , . 



Royal Astronomical Society (Geophysical Discussion), at 5. — Sir 

 Napier Shaw, Col. E. Gold, W. H. Dines, and P. J: W. Whipple: 

 The Structure of the Atmosphere up to 20 kilometres. Chair- 

 man : Dr. G. C. Simpson. 

 Institute of Transport (Graduates and Students' Section) (at 

 Royal Society of Arts), at 5.— D. J. Owen : Docks and Har- 

 bours : General Structural Lay-out, Systems of Control, Opera- 

 tion, and Charges. 

 Junior Institution of Engine^s, at 8.— D. W. Wood: Fire 

 ■ Resistance of Aggregates for Reinforced Cohcrete. ' 



RoTAL Institution of Great Britain, at 9.— Sir Robert Robertson : 

 . War Developments of Explosive's. 



SATURDAY, Mai 7. 

 Royal Institution of Great Britain, at 3.— Prof. E. C. C. Baly : 

 Chemical Reaction. 



MONDAY, Ma.1 9. 

 Royal IiJstitution of Great Britain, at 5. — General ifeeting. 

 Royal Geographical Society (at Lowther Lodge), at- 5.— Col. Sir 



Sidney Burrard : The Origin of Mountain Ranges. 

 Institution of Electrical Engineers (Informal Meeting) (at 



'Chartered ' Institute of Patent Agents), at 7. 

 Institution of Mechanical Engineers (Graduates' Meeting), at 7. 

 — W. H. Sawyer: The Engineering Aspect of Modern Iron- 

 foundry Practice. 

 Faraday Society (at Chemical Society), at 8.— E. K. Rideal and 

 ,U. R. Tivans : The Problem of the Fuel Cell.— X.. F. Knapp : The 

 Solubility of Small Particles and the Stability of Colloids. — Prof. 

 F. G. Donnan : Note on a Formula Expressing the Variation of 

 Surface Tension with Temperature.^Studies in Capillarity : 

 Continuation of Discussion held at Manchester on the following 

 . papers: — A. Ferguson: Part I. Some General Considerations and 

 a Discussion of the Methods of M<'a8urlng Interfacial Tensions. — 

 A. Ferguson and P. E. Dowson : Part II. A Modification of the 

 CapillaVv Tube Method for the Measurement of Surface Tensions. 

 Surveyors' Institution, at? 8.— T. • A. O'Donahue : The Valuation 

 of -Mineral Properties, with Special Reference to Post-War Con- 

 ditions. , , . 

 TUESDAY. Mat 10. 

 Royal Institution 6f Great "BRiTAtN, at 3. — ^Prof. A. Keith : 

 rvarwin's Theory of Man's Origin in the Light of Prcsent-Day 

 Evidence. . ' , , . 

 Institution of Petroleum Technologists (at Royal Society of 

 Arts), at fi.30.^-Prof . • P. -Carmody : Trinidad ft» a Key to the 

 Origin of Petroleum. . 

 Zoological Society or London, at .5.30. — R. I. Pocock : The 

 Auditory Bulla and other Cranial Characters in the Mustelidse 

 (Martens.- Ba-dgers, -etc.^: — G. S. Thflpar : The Venous- Rvstem 

 of the Lizard, Varanus hengalensis, Daud. — Dr. C. W. Andrews : 

 The Skull of Dinotherium gig^anteum in the British Museum. 

 Royal Photographic Society', at 7.— ^L. P. Glerc : The Theory of 

 the Screen in Half-Tone Work.-r-K. C. D. Hickman : Suggestions 

 for a New Printing Process. — Prof. The Svedberg : Behaviour 

 ' of the ■ Silver Bromide Particles in Dry Plates towards Light, 



a and /J Rays. ' ' 



iJuEKETT MiCBoacOPicxr Club, at 7.30. ■ ' ' , 



; ' WEDNESDAY, May 11. - 



■ Nkwcomen Society, (at Iron and Steel Institute), at 5. — ^Rhys 

 Jenkins : Rise and Fall of the Sussex Iron Industry (conclusion). 

 Royal Society of Arts, at 6.— A. R. Haves: Phonoscript ; A New 



^'■^fTinrl in the Phonetic Teaching of English Pronunciation. 



Royal Mtcroscoptcal Society (Metallurgical -Seietion), at 7.30.— 



, O. ratchin : The Application of 'Microscopy to the Metal In- 



: dustry. -. '■,■■;•■ . '. -, ■ , 



Institution of Automobile Engineers (at Institution of l^eoha&ioal 



Engineers), at -8. - . - , 



THURSDAY, MkTn. • , 



Royal Iiistitution- or Great Britain, at 3.— Dr. C-. S. -Myers:' 



■Pflvchplogioal. Studies:- (2) The Appreoiation- of Mjisic. • 

 Institute, of .PATHotoor and Research (St. Mary'6 Hospital, -Pifd- 



dington), at 4.30.— Sir James Mackeniie : The Opportunities of 

 the General Practitioner are Essential for the Investigation of 

 Disease and for the Progress of Medicine. 



Royal Society, at i.30.~Probable Papers.— Q. W. Walker : The 

 Problem of Finite Focal Depth revealed by Seismometers.— E. A. 

 Griffiths : A Liquid Oxygen Vaporiser.— Dorothy M. Palmer and 

 W. G. Palmer : Some Experiments on the Catalytic Reduction of 

 Ethylene to Ethane.— W. G. Palmer : The Catalytic Activity of 

 Copper. Part II.— Prof. J. P. Jenkin and D. N. Shorthose : The 

 Total Heat Of Liquid Carbonic Acid.— Dr. A. O. Bankine : The 

 Viscosity and Molecular Dimensions of Gaseous Cyanogen. 



London Mathematical Society (at Royal Astronomical Society), 

 at 5. 



FRIDAY, May 13. 



Royal Astronomical Society, at 5. 



Phtsicai, Society of London (at Imperial College of Science and 

 Technology), at 5.— L. Hartshorn and E. S. Keeping: Notes on 

 Vacuum Tubes used as Detectors of Electrical Oscillations. — 

 B. W. Clack : The Coefficient of Diffusion of Certain Saturated 

 Solutions. — Dr. G. D. West : Experiments on Thermal Transpir.v- 

 tion Currents. 



RoTAL Society of Medicine (Clinical Section), at 5.30.— Annual 

 General Meeting. 



Royal iNSTiturioN of Great Britain, at 9. — Dr. W. Bateson : 

 The Deteimination of Sex. 



SATURDAY, May 14. 

 Royal Institution of Great Britain, at 3.— Prof. E. C. C. Baly : 

 Chemical Reaction. 



CONTENTS. PAGR 



Physics a Profession ... 289 



Polar Exploration. By Dr. Hugh Robert Mill 291 



Marine Deposits. By Prof. J. W. Gregory, F. R.S. 292 



Study of Plants in the Field 293 ' 



An Historical Cataloe:ue of Science 294 



Maps and Map-reading . ■ , . 294 



Our Bookshelf ... 295 



Letters to thp Editor: - 



A Comparison of British and German Volumetric 



Glasswaie. — Sir J E. Petavel, F. R.S. . . 297 



Young's Interference Experiment. — Right Hon. 



Lord Ravleigh, K.R.*-. 298 

 An Addition to the British Fauna {Rhynchodemus 



Srharfi\. — Proi'. Arthur Dendy, F. R.S. 298 

 Method of Cutting Sections of Cotton Hairs. — H. J. 



Denham ... ... 299 



An Unknown Organism in Flint. (Ilhis/ra(ed) — C. 



Carus-Wilsoii 299 

 Ocean Tides.— A. C. Tennint; Prof J. Proud- 

 man . .... 29^ 



The Physical Continuity of "Space."— L. C. W. 



Bonacina 300 



Logs and Antilogs.— R. T. A. L 300 



The Colour of Primrose Flowers. — Major R. O. 



Latham; The "v-riier of the Article . . . 301 



The Resonance Theory of Hearing. — Dr. W. 



Perrett . . ..... 301 



Biological Terminology. — Dr. F. A. Bather, 



F.R.S. . . . . " .... 301 



Experimental Geometry. — Dr. Norman R. Camp- 

 bell . ... . . ' . . 301 



Italian Meteorites. — Prof. W. M. F. Petrie, F.R.S. 301 

 The Centenary of Napoleon. By Erg.-Comdr. 



Edgar C. Smith, O.B.E., R.N 302 



The Annular -Eclipse of April 8 \Illnslrated.), By 



Major W. J. S, Lockyer . . 303 



The Royal Academy. ByJ. S. D 305 



Obituary : — , 



Mr. Bertram Blount 306 



Notes ..•..■• 306 



Our Astronomical Column: — 



. - Reid's Comet . 3^' 



■ Photographic Catalogue of the Globular Cluster 



, Messier 15 .......... 311 



A Photo-electric Study of Algol . . . . . . • • 3ri' 



The Inauguration of the Institute of Physics . . . 312 



The. British Science Guild ........ 313 



Early Chronology of Sumer and Egypt . .... 315 



Imperial Forestry Education • • Si-S, 



University and Educational Intelligence . 316 



Calendar of Scientific Pioneers . • • -' •,• • • 3i7 



Societies and Academies . . . . " . 3^7' 



Books Received . . . ■ .. ,' . ..". • . • •'• • 319 



Diary of Societies . ■■if>m;ri;-rv ,■ . ; v .^j; . . 319 



NO. 2688, VOL. 107] 



