Nature^ 1 

 April 15, igaoj 



Index 



XXXV 



Palaeontology and the Evolution Theory, D. M. S. Watson, 



485 



Palestine : Some Features in the 1 opography and Geo- 

 logical History of, H. H. Thomas, 345 ; Upper Air 

 over, Some Observations of the, Capt. A. J. Bamford, 

 366 



Panama Canal, Source of Power for the Plant and 

 Machinery of the, 400 



Pan-American Union, Bulletin of the, 9 



Panorpoid Complex, The, part iii. : The Wing-venation, 

 Dr. R. J. Tillyard, 408 



Paper : Micro-organisms Living in, their Resistance to the 

 Action of Heat and of Time, V. Galippe, 347 ; Pulp in 

 Australia, Manufacture of, 64 



Papua, Unexplored, S. H. Ray, 663 



Paravane or Otter, The, R. F. McKay, 487 



Paris : Academy of Sciences, Prize Awards of the, 512 ; 

 Bonaparte and I.outreuil Foundations, 550 ; Prizes Pro- 

 posed for 1921, 577; the University of. Dr. Sebileau 

 Appointed Professor of Laryngology in, 107; Courses of 

 Instruction in the Faculty of Medicine of, 364; Prof. 

 H. G. Greenish Nominated for the Honorary Doctorate 

 Degree of, 397 



Pavia University, Retirement of Prof. C. Golgi from the 

 Chair of General Pathology and Histology in, 19 



Poach-growing, H. Pi Gould, 495 



Pearson's Fornmte for Psychophysics, the Availability of. 

 Prize .\warded to Dr. G. H. Thomson for a Paper on, 

 608 



Peas, Culinary, The Genetics of " Rogues " among, Prof. 

 W. Bateson and Caroline Pellew, 649 



Peat Investigation Ofllcer, Prof. P. Purcell Appointed, 540 



Pellagra, Pathology of, Dr. H. E. Roaf, 520 



Penrose's .\m\ual, edited by W. Gamble, 690 



Pens^es sur la Science, la Guerre et sur des Sujets trfes 

 Varies, Dr. M. Lecat, 689 



Pcrchlorate, The Electrolytic Formation of, J. G. Williams, 



Percussion Figures in Isotropic Solids, J. W. French, 312 ; 

 W. J. Lewis Abbott, 600 



Perseids, The Recent Shower of, 12 



Petrified Plants from the Silicified Peat-bed in the Old Red 

 Sandstone of Rhynie, Dr. R. Kidston and Prof. W. H. 

 Lang, 641 



Petrograd, Conditions of Scientific Men and Scientific Col- 

 lections in. Dr. Tolmatcheff, 443 



Petrographic Subjects, Articles on. Prof. W. Deeckc, 673 



Phagocytosis and Protozoa, E. S. Goodrich, 456 



Pheasant and Gold Campine Fowl, The Spermatogenesis 

 of Infertile Hybrids between, D. W. Cutlei', 81 



Phenakite and Scheelite at Wheal Cock, St. Just, Occur- 

 rence of, A. Russell, 326 



Phenological Returns, Royal Meteorological Society's, 

 H. B. Adames and J. E. Clark, 437 



Pheretiina posthuma, The Excretory System of, K. N. 

 Babl, 359 



Philippine Earthquakes in 1918, Rev. M. S. Mas6, g8 



Philosophical Club of the Royal Society, Annals of the. 

 Written from its Minute Books, Prof. T. G. Bonney, 



45 



Phonetic Theory, Some Questions of, Chap, v.. The Per- 

 ception of Sound, W. Perrett, 591 



Photographic : Arts and Crafts Exhibition, Forthcoming, 

 443 ; Plate, Action of a Weak Solution of a Soluble 

 Iodide on a, S. E. Sheppard and G. Meyer, 642 ; Cause 

 of the Shape of the Characteristic Curve of a. Dr.' 

 R. E. Slade and G. I. Higson, 510 



Photography : of Coloured Objects, The, Sir William J. 

 Pope, 346; Progress of. Chapman Jones, 251 



Photometer, A New Form of, H. T. Harrison, 358 



Photo :-electric Spectrophotometry, Experiments on, by the 

 Null Method, K. S. Gibson, 478; synthesis and the 

 Electronic Theory, Prof. H. H. Di.xon and H. H. 

 Poole, ()82 



Phyllophaga, The Natural Enemies of, J. J. Davis, 40 



Physical : and Chemical Constants, an American Com- 

 pendium of, Forthcoming Compilation of, 340 ; and 

 Optical Societies' Annual Exhibition, The Forthcoming, 

 417, 514: Chemistry, Prof. W. C. McC. Lewis, 3; 

 — Past and Present, Prof. J. C. Philip, 223 ; Labora- 



tory Experiments for Engineering Students, Profs. S. 

 Sheldon and E. Hausmann. Part i.. Mechanics, Sound, 

 Heat, and Light, 4 ; Properties, Measurement of, at 

 High Temperatures, A. G. Tarrant, 523 ; Science, 

 X-rays in, Prof. W. H. Bragg, 235 ; Society of 

 London, Election of Officers and Council of the, 701 



Physics: A Manual of. Dr. J. A. Crowthcr, 658; .Applied, 

 Dictionary of. Forthcoming Publication of a, 320 ; at 

 the British Association, 434 ; Elements of. Dr. R. A. 

 Houstoun, 658; for Medical Students, Dr. H. S. Allen, 

 658 ; in War, 2 ; the Commercial Applications of, 

 Forthcoming Lectures on, C. R. Darling, 386 



Physiology : and Biochemistry in Modern Medicine, Prof. 

 J. J. R. Macleod, assisted by Dr. R. G. Pearce and 

 others, 389; and Medicine, Prof. W. M. Bayliss, 389; 

 at the British Association, 519; Developments of. Sir 

 E. Sharpey Schafer, 207 ; General, Journal of, 15 ; 

 General, An Introduction to, with Practical E.xercises, 

 Prof. W. M. Bayliss, 654 ; Maminalian, Prof. C. S. 

 Sherrington, 71; Modern, 654; of Muscular Exercise, 



59" 



Physique pendant la Guerre, Les Applications de la, 

 H. Vigneron, 2 ' 



Phytopathological Society, Establishment of a Canadian 

 Branch of the ; Meeting of the ; Prof. A. H. R. 

 BuUer Elected President, 541 



Pigeons : Inheritance, Fertility, and the Dominance of Sex 

 and Colour in Hybrids of Wild Species of, Prof. C. O. 

 Whitman, edited by Dr. O. Riddle, 566 ; Orthogenetic 

 Evolution in, Prof. C. O. Whitman, edited by Dr. 

 O. Riddle, 566; The Behavior of. Prof. C. O. Whit- 

 man, edited by Prof. H. A. Carr, 566 



Pines, Experimental Bacterial Tumours in, J. Dufr^noy, 168 



Pistia and the Lemnaceae, The Vegetative Morphology of, 

 Agnes Arber, 345 



Pitot Tube, An Integrating, for Measuring the Average 

 Velocity of Variable Currents, Y. Delage, 683 



Place-names, Formation of a Committee on, 97 



Planets : and Comets, Aphelia of, C. D. Perrine, 343 ; in 

 December, Heliocentric Grouping of, 361 ; Minor, 100 ; 

 Dr. F. Cohn, 511 ; The Constitution of the Ring of. 

 Prof. Stroobant, 676 



Planetary Rotation Periods and Group Ratios, F. A. Black, 

 370 



Plane Strain : The Direct Determination of Stress, S. D. 

 Carothers, 617 



Plankton, Contribution to the Quantitative Study of. Dr. 

 E. J. Allen, 707 



Platinum in Canada, J. J. O'Neill, 574 



Plant : Life on Land, The Origin of, 024 ; -growth. Effect 

 of Nitrogen-fi.xing Organisms and Nucleic Acid Deriva- 

 tives on, W. B. Bottomley, 345 ; -lice in the Tropics, 

 648; Morphology, Applied, 578; Nutrition, Experiments 

 on, J. S. Burd, D. R. Hoagland, 446; -sports Produced 

 at VVill, Col. H. E. Rawson, 346 ; the Living, Botany 

 of, Prof. F". O. Bower, 274 



Plants : The Response of, to Wirtless Stimulation, Sir 

 J. C. Bose, 172 ; and Ferns, A Dictionary of the. Dr. 

 J. C. Willis. Fourth edition, 410; and Ferns, Flower- 

 ing, 410 



Pleistocene Deposits around Cambridge, The, Prof. J. E. 

 Marr, 386 



Pleochroic Haloes, Reversed, Prof. J. Jolv and J. H. J. 

 Poole, 92 



Plumage : Bill, Promotion of a, H. J. Massingham, 413 ; 

 Prof. J. E. Duerden, 499; Proposals for a, L. Gardiner, 

 W. Dewar, 564 ; Relation of, to Ovarian Condition, 

 Drs. L. J. Cole and W. A Lippincott, 81 



Polarisation Electromotive Forces of Iron in Solutions of 

 Complex Salts, N. R. Dhar and G. Urbain, 618 



Political Science, Bishop J. E. C. Wclldon, 494 



Polypodium spinulosum, Burm. f., Identity of. Prof. E. D. 

 Merrill, 20 



Poplar, The mielUe of the, G. Tanret, 367 



Porcelain, The Porosity of, C. C. Farr, 517 



Potash : Recovery at Cement Plants, . 137 ; Salts, The 

 Deposits of, in the Punjab Salt Range and Kohat, 

 Dr. M. Stuart, 268 



Potato-tubers, A Fungus Disease of, 341 



Potentiometer, Rectangular Component Alternating-current, 



