Nature, 
August 11, 1923 
Title Index 
xlix 

Janets : Giant, Present Condition of the, Dr. H. Jeffreys, 
615; Observation of the, and Relativity, J. Trousset, 
554 
Plankton Investigations in the Irish Sea, Some Results of, 
Sir William Herdman, 448 
Plant and Animal Designs in the Mural Decorations of an 
Uriya Village, Dr. N. Annandale, 832; Cuticle, The 
Strength of the, Prof. V. H. Blackman and others, 
373; Distribution, Soil Acidity and, C. Olsen, 791 ; 
Ecology, Dr. E. Frey and others, 827; Extracts, 
Effect of, on Blood Sugar, Prof. J. B> Collip, 571; 
Gall, Structure and Origin of the, Prof. M. T. Cook, 
483 ; -life, The Earlier Records of, Prof. A. C. Seward, 
485; Physiology in Agriculture, The Role of, Mrs. 
Howard, 413 ; Products, The Photosynthesis of, Prof. 
I. M. Heilbron, 502; Protoplasm, Observations on 
the Necrobiosis of, with the Aid of a New Reagent, 
P. Becquerel, 451 
Plants : Comparative Embryology of, Prof. F. O. Bower, 
270; Diseases of, in England in 1920-21, Dr. E. J. 
Butler, 416; Modification of, submitted to Culture 
under Glass, Mlle. L. Blum, 655; New, under Cultiva- 
tion, Dr. Stapf, 480; The Respiratory System of, 
M. Popoff, 451; Virus Diseases of, Dr. E. J. Butler, 
h: 
‘ 55 
Plasmodia, etc., The Imitation of, A. L. Herrera, 655 
Plasmopara, Infection and Cytological Studies of, M. 
Nishimura, 547 
Plaster of Paris, Baking of, and its Preservation in Moist 
Air, P. Jolibois and P. Lefebvre, 831 
Pleasure Principle, Beyond the, Dr. S. Freud. Translated 
by C. J. M. Hubback, 316 
Pleiades, Observations of the, with the Heterochrome 
Photometer of the Paris Observatory, C. Nordmann 
and C. Le Morvan, 655 
Pocket Magnifier, A New Type of, Cooke, Troughton and 
Simms, Ltd., 509 
Poetry and Science, No Opposition between, O.C. de C. 
Ellis, 890 
Poincaré Electron in Weyl’s Geometry, The Interior and 
Exterior Space-time forms of the, J. Marshall, 795 
Poisoning by Illuminating Gas, 293 
Polariscope and the Polarising Microscope, The Early 
History of the, Prof. F. J. Cheshire, 171 
Polarity, G. Sainsbury, 78 
Pole, North, Abandonment of Capt. Amundsen’s Projected 
Flight across the, 890 
Polish : Chemists and Physicists, The First Congress of, 
579; Wheat Cross, Peculiar, F. L. Engledow, 719 
Polyphenols: An Application of the Antioxygen Power 
of the, A. Gillet and F. Giot, 867; A Verification of 
the Antioxygen Power of the, A. Gillet, 795 
Polysiphonia, The Genus, Lily Batten, 67 
Polythrincium Trifolii, The Life History of, J. S. B. 
Elliott and O. P. ‘Stansfield, 553 
Pomology, Journal of, and Horticultural Science, 340 
Population in the Cambridge Region in Early Times, 
Distribution of, C. Fox, 67 
Porto: Rico, Physiography of, A. K. Lobeck, 443; Santo 
in Pleistocene Times, Prof. T. D. A. Cockerell, 464 
Positions at Sea, A Radio-acoustic Method of locating, 
Dr. A. B. Wood and Capt. H. E. Brown, 887 
Post-Columbian Words used by the Indians of S. America, 
Deductions suggested by the Geographical Distribu- 
tion of some, Baron Erland Nordenskiold, 665 
Pot Furnaces, Organising for Production from, W. W. 
Warren, 420 
Potassium Permanganate, The Photochemistry of, Pts. I. 
and II., Dr. E. K. Rideal and R. G. W. Norrish, 168 
Potato: Foliage, The Cause of Rolling in, P. A. Murphy, 
487; Regeneration of the, by Grafting, L. Daniel, 
520; The Mildew of, Action of Insoluble Oxides on, 
M. and Mme. G. Villedieu, 383; Tuber, The Causal 
Anatomy of the, Prof. J. H. Priestley, 553 
Poultry Keeping on the Farm, E. Brown, 804 
Powders, The Properties of, J. H. Shaxby and J. C. Evans, 
E. E. Walker, 690 
Prague : Academy of Sciences of, Bulletin International of 
the, 822; Charles’ University, The degree of Doctor 
Rerum Naturalium conferred on J. G. F. Druce, 102 
Preservation and Restoration, 313 
Primitive Plants, The Relation of Size to the Elaboration 
of Form and Structure of the Vascular Tracts in, 
Prof. F. O. Bower, 419 
Primulas of Central Asia, F. K. Ward, 443 
Princeton University, conferment of the honorary degree 
of doctor of laws upon Sir Frederic Kenyon, 301 
« Principia,” Definitions and Laws of Motion in the, Prof. 
W. Peddie, Prof. F. E. Hackett, 395 
Printing Works, Lighting of, L. Gaster, 612 
Procellose, A New Sugar, G. Bertrand and Mlle. S. Benoist, 
903 
Productivity, Genetics of, Sax and Gowen, 582 
Protein Molecule Existence of an Unidentified Sulphur 
Grouping in the, L. J. Harris, 274 
Protozoa of the Soil, The, D. W. Cutler, 653 
Pseudo-Butyl-Diphenylcarbinol Series, A Molecular Trans- 
position in the, P. Ramart, 452 
Psilotaceez, Modern, and’ Archaic Terrestrial Plants, Prof. 
B. Sahni, 84 
Psychical Research : Proceedings of the Society for. Vol. 
33, Part 86, 211 ; The Goligher Circle, May to August 
1921, Dr. E. E. Fournier d’Albe, 139 
Psychics, Physics and, Surg. Rear-Admiral C. M. Beadnell, 
139 
Psychoanalysis, Fundamental Conceptions of, Dr. A. A. 
Brill, 316; Studies in, An Account of Twenty-seven 
Concrete Cases preceded by a Theoretical Exposition, 
C. Baudouin. Translated by E. and C. Paul, 316 
Psycho-biology, E. S. Russell, 419 
Psychologie, vergleichenden, Handbuch der, 
gegeben von G. Kafka. Bands 1, 2, 3, 354 
Psychology : and Criminal Responsibility, Dr. W. Brown, 
581 ; Comparative, 354; Group, and the Analysis of 
the Ego, Dr. S. Freud. Translated by J. Strachey, | 
321; Medical, and Psychical Research, Dr. T. W. 
Mitchell, 316 ; Normaland Abnormal, 316 ; Scientific, 
The Elements of, Prof. K. Dunlap, 392; The Position 
of, Sir Charles Sherrington, 439 
Psychotherapy, 803 
Public Analysts, Society of, election of officers and 
council of the, 266 
Pulfrich’s Experiment demonstrating Time-lag in Vision, 
F. Ll. Hopwood, 691 
Puzzle Paper Band, A, Prof. C. V. Boys, 774; Annie D. 
Betts, 882 - 
Pylaiella litoralis, The Life History and Cytology of, Miss 
Margery Knight, 420 
Pyramids of Meroe, The, and the Candaces of Ethiopia, 
Prof. G. A. Reisner, 410 
Heraus- 
Quaker Aspects of Truth, Dr. E. V. Brown, 145 
Quantum Theory: The, Prof. F. Reiche. Translated by 
Dr. H. S. Hatfield and H. L. Brose, 279 ; The Develop- 
ment of the, Prof. H. S. Allen, 279; The Wave Theory 
and the, Prof. C. G. Darwin, 771 
Quartz (Silver Sand), The Effect of Long Grinding on, 
R. C. Ray, 169 
Quest film, the, 58 
Quimica Experimental, Prof. R.Galarza. I.: Mineral, 285 
Race Study, Mental and Physical Characters in, Prof. 
H. J. Fleure, 268 
Radiation: Primary and Secondary, Prof. H. A. Lorentz, 
791; Problem, Present Position of the, Dr. J. H. 
Jeans, 761 ; Theory, 791 
Radio: Amateur’s Hand Book, The, A. F. Collins, 427 ; 
-Communication, Science and, Sir Richard Glazebrook, 
709; in Relation to Weather Observations, E. B. 
Calvert, 720; Phone Receiving: a Practical Book for 
Everybody. Edited by Prof. E. Hausmann, 628 ; 
Receiving : Outfit, and Radio Receiving Equipment 
with Crystal Detector, Home-made, 614; Sets, U.S. 
circulars on, 781; -telephonic Communication be- 
tween Great Britain and the United States, 93; 
Telephony, Long-Distance, 123; Transmittance of 
the Telegraph Alphabet, Genl. Squier, 783; Year 
Book, The, 1923, 460 
Radioactive Disintegration, S. Rosseland, 357 
