XX 



Index. 



[Nature, 

 Sei>tember 29, 1921 



Panavano (N.), and C. Mazzetti, Transformation of Light 

 into Heavy Magnesia, 254 



Parry (H.), A Balance Method of Using the Quadrant 

 Electrometer for the Measurement of Power, 253 



Pars (L. A.), awarded a Smith's Prize, Cambridge Lniver- 

 sity, 60 ; elected to a Fellowship at Jesus College, Cam- 

 bridge, 348 



Parsons (Prof. F. G.), The Modern Londoner and Long 

 Barrow Man, i86 



Partington (Prof. J. R.), A Modern Inorganic Chemistry, 

 269 ; A Text-book of Inorganic Chemistry for Univer- 

 sity Students, 198 ; Molecular Structure and Energy, 

 172 ; Physical and Inorganic Chemistry, 262 ; The 

 Reparation Act and Scientific Research, 394 ; The 

 Ratio of the Specific Heats of Air and of Carbon 

 Dioxide, 541 ; and C. L. Bryant, British Laboratory 

 Ware and Chemicals, 457 



Partington (Mrs. M.), Set of Cards for Teaching Chemical 

 Formulae and Equations, 29^ 



Pascal (M.), SMperficial Circulation, i., 127 ; iii., 671 



Pascoe (E. H.), Petroleum in the Punjab and North- 

 western Frontier Province, 792 



Pastorelli and Rapkin, Ltd., List of Hydrometers and 

 Specific-gravity Instruments, 247 



Patterson (Prof. A. H.), The Elementary Particle of Posi- 

 tive Electricity, 75 



Patton (Major W. S.), The Mesopotamian House-flies and 

 their Allies, 117 



Paulsen (G.), Studies in the Vegetation of Pamir, 270 



Pavillard (J.), Gymnodinium pseudonoctiluca, 287 



Payn (H.), [obituary], 242 



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



Pealing (H.), The Reflection of X-ray Spectrum of Palladium 

 from Fluorspar, 477 



Pear (Prof. T. H.), Psychotherapy and War Experience, 

 122 



Pearl (Prof. R.), A Single Numerical Index of the Age- 

 distribution of a Population, 223 ; The Conditions of 

 Cellular Immortality, 404 ; and L. J. Reed, The Rate 

 of Growth of the Population of the United States since 

 1790, 94 



Pearsall (W. H.), The Development of Vegetation in the 

 English Lakes, considered in Relation to the General 

 Evolution of Glacial Lakes and Rock Basins, 509 



Pease (F. G.), Measurement of the Diameter of .Arcturus, 

 725 



Peck (E. S.), British Pharmacy and its Possibilities, 564 



P^labon (H.), The Resistance of Thallium Sulphide and 

 Selenide, 731; ; The Resistivity of Selenium, 790 



Pelseneer (P.), Les Variations et leur H^r^dit^ chez les 

 Mollusques, 7 



Penfold (A. R.), The Occurrence of a New Phenol in the 

 Essential Oils of the Leptospermum, 703 



Percival (Prof. J.), Species and Races of Wheat, 538 



Peringuey (Dr.). The Use of the Stone Querns of the 

 -Bushmen, 469 



Perkins (Prof. A. J.), Agricultural Education. 442 



Perkins (Dr.), The Food of Trout caught in the Torquay 

 Reservoirs, 757 



Perkins (Dr. R. C. L.), Variation exhibited by the British 

 Species of Parasitic Bumble-bees of the Genus Psithyrus, 

 564 



Perot (A.), Investigation of the Einstein Spectral Shift, 182 



Perotti (R.), Radical Bacilli of Diblotaxis erucoides, 127 



Perrett (Dr. W.), The Resonance Theory of Hearing, 301 



Perrier (C). The True Nature of Rosa'site, 351 

 Perrier (Prof. E.), [death], 721; [obituarv article]. S19 

 Perry (Sir Cooper). Report on the University of London 



for 1920-21, 348 

 Perrv (W. J.), The Development and Spread of Civilisa- 

 tion, 146; The Nature of Man, 710 

 Perrycoste (F. H.), The Colours of Primroses. 459 

 Pes (Prof. G.), Nuova Navigazione Astronomica: Le Rette 

 di _ Posizione. Teoria-Applicazioni-Tavole. Seconda 

 edizione, 777 

 Petavel (Sir J. E.), A Comparison of British and German 



Volumetric Glassware, 297 

 Petersen (Dr. C. G. J.). On the Stock of Plaice in Relation 

 to the Intensive Fishing of the Present Times in the 

 Belt Sea and other Waters, 407 

 Pethybridge (Dr. G. H.), awarded the Boyle Medal of the 



Royal Dublin Society, 51 ; Sexual Organs of Phyto- 

 phthora, 204 • 

 Petit (Prof. G.)i The Effect of Radio-activity on the Fer- 

 tility of the Soil, 118 

 Petrie (Prof. W. M. Flinders), Co-operative Indexing of 

 Periodical Literature, 550 ; Itahan Meteorites, 301 ; 

 Theban Tombs, 70 ; Tools and Weapons : Illustrated by 

 the Egyptian Collection in University College, London, 

 and 2,000 Outlines from other Sources, 230; Work of 

 the British School in Egypt, 564 

 Petronievics (Dr. B.), The Law of Irreversible Evolution, 



501 

 Peyronel (B.), Ascophorous Form of Rbacodiella castaneae, 



the Cause of Smut in the Chestnut, 127 

 Pfeil (L. B.), appointed Assistant Lecturer in Metallurgy 



at the University College of Swansea, 637 

 Philip (A.), Calendar Reform, 235 

 Phillpotts (Dr. Bertha S.), The Elder Edda and Ancient 



Scandinavian Drama, 168 

 Philpot (H. P.), appointed Professor of Civil and Mechani- 

 cal Engineering at the Finsbury Technical College, 830 

 Pickering (Prof. W. H.), The Rotation of \'enus, 88 

 Picon (M.), A New Method of Preparing the Sodium Deriva- 

 tives of the True Acetylene Hydrocarbons, 735 

 Picone (M.), Potential of a Double Surface Layer, 478 

 Pidduck (F. B.), Measurement of Small Inductance, 623 

 Pieragnoli (L.), Pathology of Pliocene and Post-pliocene 



Mammals of Tuscany, 671 

 Pierrat (M.), The Solubility of Various Potassium Salts in 



Mixtures of Water and .Alcohol, 382 

 Pitt (St. George Lane-Fox), Free Will and Destiny, with 



Open Letter on the International Moral Education 



Congress and League of Nations, Sir Frederick Pollock, 



and Appendix, F. J. Gould, 35 

 Plaskett (Dr. H. H.), Radiation from the Carbon .'\rc, 648 

 Plavfair (G. I.), Australian Fresh-water Flagellates, 575 

 Pledge (J. H.), The Use of Light-filters in Microscopy, 



252 

 Plehn (Dr. M.), A Cause of Disease in Fish Kept in Tanks 



and Ponds^ 823 

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



664 

 Plucknett (T. F. T.), elected Choate Memorial Fellow at 



Harvard College, 830 

 Plummer (Alderman H.), gift to Manchester University, 572 

 Plummer (Prof. H. C), appointed Professor of Mathematics 



at the Artillery College, Woolwich, 604 

 Plymen (G. H.), The Geology of Jersey, 827 

 Pocklington (Dr. H. C), An Algebraical Identity, 587 

 Poitevin <E.), and H. U. Ellsworth, Hydrous Calcium 



Borate Inyoite Found at the Whitehead Gypsum Quarry, 



Hillsborough, New Brunswick, 823 

 Politis (J.), The Brown Corpuscles Causing the Browning 



of the Vine, 287 

 Pollard (Prof. A.), Ihe Measurement of Single and Succes- 

 sive Short Time-intervals, 585 

 Pommereau (H. de), The Reduction of Ethyl Naphthoate 



and a Case of Reduction of an Alcohol to Hydrocarbon 



by Sodium and Absolute Alcohol, 607 

 Ponder (E.}, A Method for Investigating the Haemolytic 



Activity of Chemical Substances, 509 

 Poole (H. 'H.), The Electrical Conductivity of Some Di- 

 electrics, 253 ; The Nature of the Electrical Conductivity 



of Glass, 584 

 Pope (Sir William J.), elected Membre d'Honneur of the 



French Chemical Society, 21 

 Popesco (J.), The Valuje of the Surface Tension of Mercury 



in Various Gases, 607 

 Porter (Prof. A. W.), Some Aspects of the Scientific Work 



of the late Lord Rayleigh, 252 ; Variation of Surface 



Tension and Surface Energy with Temperature, 702 

 Porter (C. W.), and F. H. Thurber, A Compound which 



may Contain Univalent Oxygen, 600 

 Portevin (A.), The Electrical Resistance of the Nickel-steels, 



94 ; The Use of very Slow Cooling , for the Micro- 

 graphical Study of A'lloys and the Structure of the 



Tungsten S'teels, 350 

 Potter (Prof. M. C), British Plants Available as a Source 



of Industrial Alcohol. 170 

 Poulton ' (Prof. E. B.), The Inspiration of the Unknown, 



537 



