xlvi 



Index 



r JVattire, 



\_Set)tew,Toer 29, 1921 



and Dr. M. C. Rayner, 37 ; Breeding, The Problem of 

 Increasing the Field of Cereal Crops "by, F. L. Engle- 

 dow, 509 ; Cell, The Microsomes and the Lipoid 

 Formations of the, A. Guilliermond, 671 ; The Struc- 

 ture of the, in its Relations with the Theory of the 

 Chondriome, P. A. Dangeard, 735 ; Development, 

 Influence of Organic Substances on, G. Ciamician and 

 C. Ravenna, 254 ; Evolution, Prof. A. C. Seward, 197 ; 

 -growth. Observations of, with the Recording Ultra- 

 micrometer, J. J. Dowling, 523 ; Pests and their 

 Control, Dr. W. B. Brierley, 795 

 Plants : Bacterial Diseases of, An Introduction to, E. F. 

 Smith, 168 ; British : Their Biology and Ecology, 

 J. F. Beiss and H. J. Jeffrey. Second edition, 71 ; 

 Collected by Various Members of H.M. Salonika 

 Forces, Capt. J. Ramsbottom, 92 ; Growth of. The 

 Influence of Cold in Stimulating the, F. V. Coville, 

 223 ; in the Field, Study of, 293 ; of Britain, The 

 Extinct and Dubious, Dr. G. C. Druce, 343 ; Struc- 

 ture and Reproduction of. An Introduction to the, 

 Prof. F. E. Fritch and Dr. E. J. Salisbury, 200 

 Platform Review, No. i, 349 



Plesiosaurian from the Wealden of Berwick, Sussex, 

 Remains of a New, added to the Geological Depart- 

 ment of the Natural History Museum, 469 



Pliocene and Post-Pliocene Mammals of Tuscany, Pathology 

 of, L. Pieragnoli, 671 



Plumage: (Prohibition) Bill, Second Reading of the, 212; 

 Agreement arrived at, respecting the, 341 ; The 

 Importation of, Read a Third Time, 499 ; Act, Importa- 

 tion of. Constitution of the Advisory Committee in 

 Connection with the, 821 



Podophyllum peltatum, The Chromosomic Processes in the 

 Diploidic Nuclei of, R. de Litardifere, 383 



Polar Exploration : Dr. H. R. Mill, 291 ; The Future of, 

 F. Debenham, 179 ' 



Polarisation Phenomena in an X-ray Bulb, Dr. S. Ratner, 

 522 



Polarised Light, The Use of, for the Examination of Old 

 Pictures, P. Lambert, 607 



Politics, The Principles of. An Introduction to the Study 

 of the Evolution of Political Ideas, Prof. A. R. Lord, 

 264 



Polyndmes d'Hermite, une application des, k un Problfeme 

 de Statistique, Prof. A. Guldberg, 824 



Pompeii, Recent Excavations at, 723 



Pondoland, Geolc^y of, A. L. Du Toit, 827 



Pons-Winnecke's : Comet and its Meteor Shower, W. F. 

 Denning, 15, 5.5;, 153, 373, 438, 601 : Prof. Barnard, 

 217. 247; M. Ebell, 345; Prof. Crawford and Miss 

 Levy, 405 ; T. Guillaume, 478 ; G. Merton ; Search for 

 Meteors from. Prof. Barnard ; R. G. Chandra, 694 



Popocatapetl in Eruption, 599 



Porto Santo, Natural History of, Prof. T. D. A. Cockerell, 

 10 



Positive Electricity, The Elementary Particle of, Prof. 

 A. H. Patterson, 75 



Potash Position, The, 321 



Potassium : Cyanide, The X-ray Structure of, P. A. Cooper, 

 745 ; Salts. The Solubility of Various, in Mixtures of - 

 Water and Alcohol, M. Pierrat, 382 



Potato Tubers, Sources of Infection of, with Phytophthora 

 ifestans, P. A. Murphy, 639 



Prague, International Conference of Students at, 188 



Precious Stones, Report on, for 1919, Dr. G. F. Kunz, 59 



Pre-glacial Floras, Two, from Beneath the Bculder Clay 

 of Castle Eden, Mrs. E. M. Reid, 501 



Prehistoric: Art. an Exhibition of, in Spain, 1:62; in Caves 

 and Rock-shelters, M. C. Burkitt, 460 ; Cooking-place 

 in Norfolk, A, Nina F. Layard. 623 ; Stone Weapons 

 in East Yorkshire, Origin of Materials Used in the 

 Manufacture of, T. Sheppard. 244 



Pressure Gradients and Upper Winds, Forecasting, Causes 

 of Errors in, G. M. B. Dobson, 60.'; 



Primrose Flowers, The Colour of. Major R. O. Latham ; 

 The Writer of the Article, 301 



Primroses, The Colours of. Dr. J. W. H. Harrison, 359 ; 

 G. Abbott, 395 : F. H. Perrvcoste. 459 



Prisms. The Refractometry of, J. Guild. 126 



Proboscidea : Evolution and Geographical Distribution of 



the. Dr. H. F. Osborn, 539 ; Phylogeny, and Classi- 

 • fication of the, Prof. H. F. Osborn, 500 



Procerastea, Regeneration and Reproduction of the Syllid, 

 Dr. E. J. Allen, 61 



Proper Motions, Statistics of, Prof. J. C. Kapteyn and 

 Dr. P. J. Van Rhijn, 694 



Proteid Sugar in Cancerous Subjects, The, H. Bierry, 

 F. Rathery, and Mile. Levina, 703 



Protein in Nutrition, Quality of. Dr. R. H. A. Plimmer, 

 664 



Protozoa : and the Evolution of the Gregarious Instinct, 

 R. J. Ludford, 332 ; Phenomena of " Intelligence " in 

 the, E. Heron-Allen, 456 ; Physiological Reactions in 

 the, J. S. Dunkerly, 395 



Proustite, The Spectrophotoelectrical Sensitivity of, W. W. 

 Coblentz, 694 



Psyche's Lamp : A Revaluation of Psychological Principles 

 as Foundation of all Thought, R. Briffault, 583 



Psychoanalysis: Its History, Theory, and Practice, 

 A. Tridon, 515 



Psychologie du Raisonnement, E. Rignano, 612 



Psychology : A History of. Prof. G. S. Brett. Vols, ii., 

 and iii., 806 ; Abnormal, and its Educational Applica- 

 tions, F. Watts, 264; and Psychopathology, 515; and 

 Psychotherapy, Dt. W. Brown, 711; Educational, 

 Dr. D. Starch, 164 ; Human, Prof. H. C. Warren, 

 164; of Childhood, The, Dr. Naomi Norsworthy and 

 Dr. Mary T. Whitley, 164 ; Some Aspects of, 164 



Psychopathology, Psychology and, 515 



Psychotherapy : and War Experience, Dr. W. A. Brend ; 

 Prof. T. H. Pear, 122 ; Principles and Practice of, 711 ; 

 Psychology and. Dr. W. Brown, 711 



Purple Sapphire, The, and other Posthumous Papers, 

 selected from the Unofficial Records of the University 

 of Cosmopoli by Christopher Blayre, 677 



Pyocyanic Bacillus, The Action of the, on Asparagin, E, 

 Aubel, 735 



Pyridine, The Hydrates of, M. Pariselle, 190 



Pyrolaceae and Monotropaceae, The, and the Ericaceae, Miss 

 Margaret Henderson, 765 



Pyrrhotine and Magnetite, The Expansion Anomaly accom- 

 panying the Magnetic Transformation of, P. Cheven- 

 ard, 30 



Quadrant Electrometer, A Balance Method of Using the, 

 for the Measurement of Power, H. Parry, 253 



Quantum : Theory, The, and Homogeneous Vibrations, Sir 

 Arthur Schuster, 233 ; The Kinetic Theory and the, 804 



Quartzite Implements of Rostro-carinate and Early Palaeo- 

 lithic Types in Uganda, The Discovery of Large, 

 J. Reid Moir, 649 



Queensland, North-Western, 86 



Rabbit, The Resistance of the, to .^vitaminosis. The 

 Physiological Mechanism of, J. Lopez-Lomba and 

 P. Portier, 671 



Race, Culture, and Language, The Evolution and Distribu- 

 tion of. Dr. G. Taylor, 435 



Racemic Compounds, The Active, M. Del^pine, 382 



Racial : Biology, impending Establishment in Sweden of an 

 Institute for the Investigation of Problems of, 659 ; 

 Types in South-east England, H. E. Peake, 538 



Radial Velocities, A Catalogue of, J. VoOte, 281 



Radiation : Diffuse, at Mont Blanc Observatory, Compared 

 with that at Lower Altitudes, J. Vallot, 542 ; from the 

 Carbon Arc, Dr. H. H. Plaskett, 649 ; The Laws of, 

 of a Perfectly Black Body, Dr. Coblentz, 344 



Radio : -activity, The Effect of, on the Fertility of the 

 Soil, Prof. G Petit, 118; -communication, Inter- 

 Empire Scheme for. Suggestion for an, R. Donald,^ 

 660 ; -mechanics. Directional, Apparatus for, A. Artom, 

 479 ; -stations. The Errors in the Apparent Bearings of, 

 T. L. Eckersley, 502 ; -telegraphy. Directions from 

 which Atmospheric Disturbances in, Apfvear to Come, 

 L. W. Austen, 632 ; The Wave-front Angle in, L. W. 

 Austen, 280 



Radioaktivitat und die neueste Entwicklung der Lehre von 



