XXXVl 



Index 



r Nature, 

 \_Aprit 15, 1920 



A New Form of, Prof. A. E. Kennelly and 



E. Velander, 42 

 Poultry, The Secondary Sexual Characters of, Prof. T. H. 



Morgan, 159 

 Powders: Flameless, M. Delpech, 167; The Pure " B," 



J. Delpech, 68 

 Power : Circuits, The Interference of, with Telephone 



Circuits, E. Parry, S17; Known and Unknown, 



Sources of. Sir Olirer Lodge, 397 

 Practical Chemistry, 688 



Prague, A Tribute from. Prof. B. Brauner, 374 

 Precious Stones, The Production of, in 1919, Dr. G. F. 



Kunz, 610 

 Precipitates, A New Method of Physico-chemical Analysis 



of, P. Jelibois, 523 

 Prehistoric Pottery in Eastern Macedonia and the Plain of 



Philippi, Discovery of, 178 

 Pre-history of Man in Britain, Flint Implements from the 



Chalky Boulder Clay of Suffolk, J. Reid Moir, 706 

 Pressure : and Temperature, The Effect of, on a Meter for 



Measuring the Rate of Flow of a Gas, Dr. N. W. 



McLachlan, 325 ; Distribution on the Head of a Shell 



Moving at High Velocities, L. Bairstow, R. H. Fowler, 



and D. R. Hartree, 618 

 Preventive Medicine since 1869, Dr. C. J. Martin, 210 

 Prices and Government Control, Sir Charles G. Wade, 485 

 Primary Current at Break, An Experimental Method of 



Determining the, in a Magneto, Dr. N. W. McLachlan, 



366 

 Primates, Certain Cranial Sutures in the. Dr. R. W. 



Shufeldt, 44 

 Primeverose, Characters and Composition of, A. Goris and 



Ch. Vischniac, 367 

 Princeton and other American Universities, Bequests to, 



H. C. Frick, 386 

 Prismatic Binocular, Use of a, for Viewing Near Objects, 



Capt. D. Wilson Barker, 432 

 Probability, Calcolo delle, Prof. G. Castelnuovo, 464 

 Probabilities, The Neglected Study of. Prof. G. H. Bryan, 



464 

 Process Year Book, The, vol. xxii. (Penrose's Annual), 



edited by W. Gamble, 690 

 Proctotrypid, Hyper-parasite of Aphidius (Lygocerus sp.). 



Preliminary Note on the Life-history of a. Miss M. D. 



Haviland, 366 

 Progress and Promise, 190 

 Psychical Research, Society for. Dr. W. McDougall Elected 



President of the, 608 

 Psychology, Industrial, Lectures on, B. Muscio. Second 



edition, revised, 687 ; Normal and Morbid, 624 ; The 



Modern Science of, 208 

 Psychoanalysis? What is, Dr. I. H. Coriat, 22 

 Psychon^vroses de Guerre, Traitement des, G. Roussy, 



J. Boisseau, M. d'CElsnitz, 22 

 Public Libraries, etc., Proposal for Certain Powers and 



Duties in Relation to, to be Transferred to the Board 



of Education, 522 

 Pultenaea, A Revision of the Genus, H. B. Williamson, 55s 

 Pyriform Figure, the Stability of the. The Calculations of 



G. H. Darwin on, P. Humbert, 650 

 Pyrometry, Practical, The Theory, Calibration, and Use 



of Instruments for the Measurement of High Tempera- 

 tures, E. S. Ferry, G. A. Shook, and J. R. Collins, 47 

 Pyrophorus Beetle, a Living, Photographs showing the 



Actinic Quality of the Light from, F. Martin Duncan, 



345 



Quadrant Electrometers, Improvements in Measurements 



with. Part ii., V. H. Jackson and A. T. Mukerjee, 459 

 Quadrilat^re Complet, Premiers Elements d'une Th^orie 



du, A. Oppermann, 169 

 Qualitative Analysis, A Treatise on, Prof. F. Clowes and 



J. B. Coleman. Ninth edition, 688 

 " Quantico " Typhoon, The, Rev. J. Coronas, 79 

 Quarterly Journal of Microscopical Society, Jubilee of the 



Editorship of Sir E. Ray Lankester of the, 295 

 Quaternionic System, Tne, as the Algebra of the Relations 



of Physics and Relativity, Prof. W. Peddie, 715 



Queensland : Lecythidacese, A Revised Account of the, 

 C T. White, 587 ; Mesozoic Insects of. No. 6 : Blat- 

 toidea. Dr. R. J. Tillyard, 147; No. 7, Dr. R. J. 

 Tillyard, 587 



Queen's University, Kingston, Ontario, Dr. G. S. Melvin 

 appointed Professor of Physiology in, 19 



Race: and Nationality, Prof. A. Keith, 311; An Inquiry 

 into the Origin and Growth of Patriotism, 311; Con- 

 sciousness, Rev. Dr. W. Flint, 118 



Racehorses, The Colours of. Sir William Ridgeway, 334 



Radiation : Pressure, E. G. Barter, 188 ; Megh Nad Saha, 

 448; Temperature: Dew, S. Skinner, 277; Tempera- 

 tures, S. Pickering, 153 



Radiators, Improvement of the Efficiency of, in the Heat- 

 ing of Rooms, Prof. G. H. Bryan, 487 



Radioactivity, Mesures Pratiques en Dr. W. Makower and 

 Dr. H. Geiger. Traduit de I'Anglais by E. Philippi, 

 626 



Radio-activity : and Gravitation, Sir Ernest Rutherford and 

 Dr. A. H. Compton, 412 ; of the Water from the Large 

 Spring at Bagnoles-de-l'Orne and its Variations, 

 P. Loisel, 347; Relativity and. Prof. J. Joly, 468 



Radio : -communication and the Thermionic Valve, 462 ; 

 Principles of, 330; The Principles Underlying, 330; 

 Direction and Position Finding, Capt. H. J. Round, 

 576 ; -finding .Apparatus, The Theory and Use of, Capt. 

 A. S. Blatterman, 137 



Radiographic Prints, Exhibition of, 507 



Radiology, Industrial and Medical, Dr. G. W. C. Kaye, 696 



Radio : Research Board, A, Established by the Departnrient 

 of Scientific and Industrial Research, 638 ; Review, 

 No. I, 178; -Telegraphy and Telephony, The Thermionic 

 Value and its Developments in, Prof. J. A. Fleming, 

 462 ; during the Solar Eclipse of May 29, 323 ; -trans- 

 mission and Reception, J. H. Dellinger, 543 



Radium : and the Electron, Sir Ernest Rutherford, 226 ; 

 Bromide, Methods Used in France for the Production 

 of, M. Demenitroux, 419 



Rain : Electricitv of. Effect Produced by the, on an Insu- 

 lated Wire, A. Baldit, 387 ; Map of Australia for 1918, 

 476 



Rainfall : British, 1918, Dr. H. R. Mill and M. de Carle S. 

 Salter, 411; in England in 1919, 609; of the United 

 States, The, 483 



Ramsay : Memorial Fund, Contributions to, from Holland, 

 474; the late Sir William. Unveiling of a Medallion 

 Portrait of, in the University of Glasgow, 397 ' 



" Randers Fjords Naturhistorie," 378 



Rarer Elements, The, J. H. Gardiner, 310 



Rat Destruction, Methods of, E. G. Boulenger, 97 



Ray : Plotter, A, F. G. Smith, 682 ; Society, Dr. W. T. 

 Caiman Appointed Secretary of the, 1^8 



Reaction, Heat of, and Gravitational Field, Prof. F. G. 

 Donnan, 392 



Reading, University College, Research Institute in Dairy- 

 ing, Appeal for Funds, 357 



Reconstruction, 174 



Red : Colouring Matter of Plant Galls, The, 707 ; ' -pea 

 Gall," The Colouring Matter of the. Dr. M. Nieren- 

 stein, 707 



Rede Lecture, 1919, The, Science and War, Rt. Hon. Lord 

 Moulton, 352 



Refractive Index, Variations of, F. Twyman, 315; Indices, 

 Variation of. Sir Henry A. Miers, 334 



Refractory : Materials, Expansions of, H. J. Hodsman and 

 Prof. Cobb, 379 ; Properties of Aluminous Materials, 

 H. i-e Chatelier and B. Bogitch, 128 



Relativity. La Teoria di, nel suo sviluppo storico, Dr. A. 

 Palatini, 552 



Relativity: Prof. Einstein, 360: Prof. A. S. Eddington, and 

 others, 41:4: An Exposition on. Sir Oliver Lodge, 330; 

 and Radio-activity, Prof. J. Joly, 468; and the Dis- 

 placement of Fraunhofer Lines, Prof. W. G. Duffield, 

 659 ; Discussion on. Prof. Eddington, and others, 400 : 

 Italian Papers on. Dr. L. Silberstein, 552 ; Generalised, 

 in Connection with W. J. Johnston's Symbolic Calculus, 

 Sir Joseph Larmor, 365 ; Theory, Results of the Total 



in 



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