432 



NA TURE 



[April i, 1922 



Diary of Societies. 



VJUBAY, March 31. 



Association of Economic Biologists (in Botanical Lecture Theatre, 

 Imperial College of Science and Technology), at 2.30. — Dr. W. L. Balls : 

 Advantages and Defects of Team Work in Economic Biology. — 

 Dr. F. Kidd : Problems of Fruit Storage. 



Institution of Mechanical Engineers, at 6. — Prof. H. H. Jeffcott : 

 The Milling of Screws, and other Problems in the Theory of Screw- 

 threads. 



Institution op Electrical Engineers (London Students' Section), 

 at 7.— J. S. Highfleld : Presidential Address. 



Institution of Aeronautical Engineers (at Royal Society of Arts), 

 at 7.30.— Mr. Polland : Aircraft Design. 



Junior Institution of Engineers, at 8.— D. P. Dickinson : The 

 Steel Melting Shop. 



SATURDAY, kVSXLl. 

 Royal Institution of Great Britain, at .3. — Sir Ernest Rutherford : 

 Radloacthity (5). 



MONDAY, APRILS. 

 Royal Institution of Great Britain, at 5.— General Meeting. 

 Royal Society of. Arts, at 8.— G. Radcliffe : The Constituents of 



Essential Oils (Cantor Lectures), (3). 

 Society of Chemical Industry (London Section), (at Chemical 



Society), at 8. 

 Royal Institute of British Architects, at 8. — S. C. Ramsey : 



London Clubs. 



TUESDAY, April 4. 



Royal Institution of Great Britain, at 3. — Dr. J. W. Evans : 



Earth Movements (2). 

 Royal Society of Arts (Dominions and Colonies Section), at 4.30.— 



Sir Thomas Bilbe Robinson : New Zealand. 

 Royal College of Physicians of London, at 5. — Dr. H. Mackenzie : 



Diseases of the Thyroid Gland (2). 

 Zoological Society op London, at 5.30. — C. Tate Regan : Exhibition 



of lantern-slides illustrating Blind Fresh-water Fishes from Caves. 



—Dr. J. T. Cunningham: Mendelian Experiments on Fowls. III. 



Production of Dominant Pile Colour.— Dr. M. Khalil : A Revision of 



the Nematode Parasites of Elephants, with a description of four 



new Species. 

 Institution of Civil Engineers, at 6. — Sk Robert A. Hadfield, Bart. : 



Corrosion of Ferrous Metals. 

 ROntgen society (at Institution of Electrical Engineers), at 8.15. 



WEDNESDAY, April 5. 



Institution of Electrical Engineers (Wireless Section), at 6.— 

 Capt. J. H. Whittaker-Swlnton : Provision of Power for Wireless 

 Telegraphy. 



Society of Public Analysts and Other Analytical Chemists (at 

 Chemical Society), at 8.— O. D. Roberts and H. T. Isllp : The Con- 

 stants of Indian Beeswax. — A. Chaston Chapman : Note on the Liver 

 Oil of the " Tope "{Galeus golem).— K. Chaston Chapman : Note on 

 the Examination of Foods for the Presence of Sulphites. — S. H. 

 Groom : Demonstration of Artificial Daylight for Laboratory 

 Purposes (Sheringham System).— A. Bruce : A Tropical Milk 

 Supply.— E. R. Bolton and D. G. Hewer : Certain Tropical Oilseeds. 



Royal Society of Arts, at 8.— Prof. E. R. Matthews : Sea Encroach- 

 ment and its Prevention. 



Entomological Society op London, at 8. 



THURSDAY, April 6. 



Royal Institution of Great Britain, at 3.— Prof. A. M. Hind : 

 Landscape Etchers : New and Old (2). 



Royal Society, at 4.30.— ProftaftZe Papers.— 'F. E. Smith: An Electro- 

 magnetic Method for the Measurement of the Horizontal Intensity of 

 the Earth's Magnetic Field.— G. I. Taylor : Stability of a Viscous 

 Liquid contained between two Rotating Cylinders. Part I. Theo- 

 retical. Part II. Experimental.— Prof. T. H. Havelock: Dispersion 

 Formulae and the Polarisation of Scattered Light : with Application 

 to Hydrogen.— Dr. G. R. Goldsbrough : The Cause of Encke's Division 

 in Saturn's Ring. — C. Spearman : Correlation between Arrays In a 

 Table of Correlations. — Dr. W. L. Balls : Apparatus for determining 

 the Standard Deviation Mechanically. 



Royal College of Physicians of London, at 5. — Dr. H. Mackenzie : 

 Diseases of the Thyroid Gland (3). 



Linnean Society of London, at 5. — Dr. A. B. Rendle : An 

 Example of Regeneration of the Terminal Bud. — C. Turner : The 

 Life-history of Staurastrum Diekiei, var. parallelum (Nordst.). — 

 L. C. Borradaile : The Mouth-parts of the Shore-crab, with lantern- 

 slides. 



Royal Aeronautical Society (at Royal Society of Arts), at 5 30 — 

 L. Br^guet: Aerodynamical Efficiency and the Reduction of Air 

 Transport Costs. 



Child study Society (at Royal Sanitary Institute), at 6 — M 

 Yearsley : A Plea for the Deaf Child. 



Institution of Electrical Engineers, at 6. — J. A. Kuyser : Pro- 

 tective Apparatus for Turbo- Alternators. 



Chemical Society, at 8.— Prof. M. O. Forster and W. B Saville • 

 Constitution of Plcrorocellln, a Nitrogenous Constituent of Roccella 

 fuciformis. — S. Sugden : The Determination of Surface Tension from 



. the Maximum Pressure In Bubbles. 



Civic Education League (at Leplay House, 65 Belgrave Road, 

 S.W.I), at 8.15. — Miss M. M. Barker : Occupational Education. 



FRIDAY, April 7. 

 Diesel Engine Users' Association (at Institution of Electrical 

 . Engineers), at 3. — H. Moore : Some Characteristics of Petroleum 

 Oil used In Diesel Engines. 



Royal Aeronautical Society (Students' Section) (at 7 Albemarle 



Street), at 6.45. — Prof. L. Balrstow : Some Aeronautical Problems of 



the Early Future. 

 Junior Institution of -Engineers, at 8. — J. W. Maple : Engineering 



In Southern Persia. 

 Royal Institution of Great Britain, at 9.— Sir Ernest Rutherford : 



Evolution of the Elements. 



SATURDAY, APRlh 8. 

 Royal Institution of Great Britain, at 3. — Sir Ernest Rutherford : 



Radioactivity (6). 



PUBLIC LECTURES. 



(A number in braclets indicates the number of a lecture in a series.) 

 SATURDAY, April 1. 



Polytechnic (Regent Street, W.l), at 10.30 a.m.— Prof. H. E. Arm- 

 strong : The Wonders and Problems of Food. 



HORNIMAN Museum (Forest Hill), at 3.30.— Dr. W. A. Cunnington : 

 Woman's Sphere in Savage Africa. 



WEDNESDAY, APRIL 5. 



School of Oriental Studies, at 12. — Miss Alice Werner : Bantu 

 Mythology and Folk Lore (6). 



CONTENTS. 



Science at the Post Office 



The Imperial Institute 



A Treatise on Petroleum. By Sir T. 



PAGE 

 . 401 

 ■ 403 



H. Holland, 



K.C.S.I., F.R.S 403 



Entropy as a Tangible Conception. {Ilhistratea) . 404 



The Mass Formula of Cathode-Ray Corpuscles 406 



British University Problems . . . 407 



India as a Centre of Anthropological Inquiry. By 



Sir Arthur Keith, F.R.S 408 



Our Bookshelf 409 



Letters to the Editor :— 



Precursors of Wireless Telegraphy. — Sir Joseph 



Larmor, M. P., F.R.S 410 



Stonehenge : Concerning the Four Stations. ( With 



z7/?<j/;-<2/wAZJ^.)—E. Herbert Stone . . . 410 

 Improvement of Visibility of Distant Objects. — Prof. 



Henri Bdnard 412 



Statistical Studies of Evolution. — C. A. F. Pantin ; 

 Dr. J. C. Willis, F.R.S., and G. Udny Yule, 



C.B.E., F.R.S 413 



Radiology and Physics. {With diagrams.) By Dr. 



G. W. C. Kaye 414 



Forests in Relation to Stream-flow and Erosion . 417 

 Disintegration of Elements. By Sir E. Rutherford, 



F.R.S 418 



Obituary : — 



Prof. A. D. Waller, F.R.S. By W. L. S. . . 418 



Current Topics and Events 420 



Our Astronomical Column : — 



Ratios of Planetary Distances ..... 422 



Reid's Comet, 1922 {a) 422 



Wireless Time-Signals ...... 422 



Stars of the ^ Canis Majoris Type .... 422 



Spectroscopic Parallaxes with Objective Prism 



Spectrograms 422 



The Sun's Rotation from Spectroheliograms . . 422 



Research Items 423 



University Education in the United States of Amer.ca 425 



Marine Borers in San Francisco Bay . . 426 



Universities of Oxford and Cambridge. — Report of 



Royal Commission ....... 428 



University and Educational Intelligence . . . 429 



Calendar of Industrial Pioneers .... 429 



Societies and Academies 430 



Official Publications Received 431 



Diary of Societies 432 



NO. 2735, VOL. 109] 



