September 29 



Nature, "1 



. 1921J 



Index 



xxxvu 



Electrostatic Principle, New Technical Applications of an, 



A. Johnsen and K. Rahbek, 439 

 Electrotherapy, History of, H. Colwell, 150 

 Elements, The Disintegration of, by a-Particles, Sir Ernest 



Rutherford and J. Chadwick, 41 

 Empire Cotton Growing Corporation, Grant by the Govern- 

 ment to the, 499 

 Emulsoid Colloid State, The Nature of the. Dr. S. E. 



Sheppard, 73 ; Prof. J. W. McBain, 74 

 Enchytraeidae, The Genera of the, Welch, 179 

 Encke's Comet, Detection of, J. F. Skjellerup, 825 

 Energ^tique G^n^rale, Dr. F. Michaud, 455 

 Energy : Quantum, A Physical Interpretation of the, 



I. Aucken, 553 ; Molecular Structure and, Prof. J. R. 



Partington, 172 ; Prof. A. O. Rankine, 203 

 Engineers : American and British, Conference of, 594 ; and 



Architects, Education of. The Present System of, M. E. 



Kernot, 441 

 Entomological Meeting, Third, held at Pusa on the 3rd to 



15th February, 1915, Report of the Proceedings of the. 



Edited by T. B. Fletcher, 3 vols., 455 

 Environment, Some Effects of, on Efficiency and Safety, 



Wilson, 567 

 Enzyme Action, The Nature of. Prof. W. M. Bayliss. 



Fourth edition, 232 

 Enzymes, Actjon of, v., D. Maestrini, 128 

 Enzymic and Zymic Change, The Particulate Nature of. 



Prof. H. E. Armstrong, 698 

 " Eolith " Factory, A Natural, beneath the Thanet Sand, 



S. H. Warren, 565 

 Epidemics, Experimental, Produced in Colonies of Mice, 



Dr. S. Flexner, 540 

 Eplstemological Problem, The, Prof. H. Wildon Carr, 228 

 Epsom College, Bequest to, by Dr. H. Barnes, 637 

 Equation UV= —f, Prof. M. A. R. Khan, 309 

 Equilibrium, The Law of, of Solid Grains in a Vertical 



Ascending Current of Water, R. Feret, 158 

 Eros : The Minor Planet, F. E. Seagrave, 663 ; The 



Ephemeris of. Continuation of, F. n. Seagrave, 793 

 Errera, Leo, Receueil de I'lnstitut Botanique, Tome iv., 6 

 Eskers in the Vicmity of Rochester, New York, A. W. 



Giles, 533 

 Ethnology, The Practical \'alue of. Dr. A. C. Haddon, 500 

 Ethyl Naphthoate, The Reduction of, etc., H. de Pom- 



mereau, 607 

 Ethylpropylphenylcarbinol, Synthesis and Dehydration of, 



\'. Y^ramian, 831 

 Etoiles Simples, Les, Dr. F. Henroteau, 583 

 Eugenics, International Congress of, Forthcoming, 115 

 Europe : The Present Status and Tendencies of Geography 



in, W. L. G. Joerg to Study, 434 ; The Treaty 



Settlement of, Prof. H. J. Fleure, 660 

 Eustheniidae, Revision of the Family (order Perlaria), with 



Descriptions of New Genera and Species, Dr. R. J. 



Tillyard, 800 

 Evaporation : Concentration, and Desiccation of Organic 



or Mineral Substances, A Method of, A. Sartory, 



L. Scheffler, P. Pellissier, and C. Vaucher, 222 ; from 



Large Expanses of Water, Some Problems connected 



with, M. A. Giblett, 541 ; The Mechanism of the 



Energy Exchanges in, R. Audubert, 62 

 Everest : Mount, The Ascent of, Sir Francis Younghusband 



and Prof. J. N. Collie, 12 ; The Route to, Lt.-Col. 



C. H. Bury, 52; Lt.-Col. H. H. Godwin-Austen, 137; 



Exp>edition, Progress of the, 822 

 Evolution : Initiative in, Eh". W. Kidd, 419 ; Irreversible, 



The Law of, Dr. B. Petronievics, 501 ; Insect, The 



Fundamental Factor of, S. S. Chetv^erikov, 501 ; 



Mutations and, Prof. R. R. Gates, 636; Prof. R. R. 



Gates, 714 ; The Writer of the Article, 715 

 Explosions, The Thermodynamical Theory of, i.. Sir J. B. 



Henderson ; ii.. Sir J. B. Henderson and Prof. H. R. 



Hass^, 573 

 Explosives, Some War Developments of, Sir Robert 



Robertson, 524 

 Eyes Radiate Energy? " " Can, Dr. C. Russ, 535 



Fabre Anthology, A, loi 



Fabricated Ships, M. E. Denny ; J. C. Telford, 596 



Factories, Chief Inspector of, Report of the, for 1920, 755 



Facuiae, Solar Radiation in Relation to, H. H. Clayton, 



108 

 Falmouth Observatory, Meteorological Results for 1920 at 



the, 662 

 Faraday, The Law of, and the Action of the Silent Electric 



Discharge on the Metallic Oxides, A. de Hemptinne, 



703 

 Farm : Crops, Bacterial Diseases of, 155 ; Stock, The 



Breeding and Feeding of, J. Wilson, 678 

 Farmer's Handbook, A, A Manual for Students and 



Beginners, R. C. Andrew, 679 

 Farmyard Manure, Artificial, Hutchinson and Richards, 



828 

 Fatigue : and Efficiency in the Iron and Steel Industry, 



Dr. H. M. Vernon, 156 ; Effect of, on Health and 



Longevity, Dr. H. M. Vernon and E. A. Rusher, 156 

 Fatty Acids from Natural Hydrocarbons of the Paraffin 



Type, 181 

 Faults, Know Your, R. D. Oldham, 92 

 Fauna of Scottish Lochs, The, Dr. N. Annandale, 778 

 Faune de France, No. i, Echinodcrmes, Prof. R. Kcehler, 



776 

 Feeding Experiments with Albino Rats, H. A. Cheplin and 



L. F. Rettger, 223 

 Fern, Variegation in a. Dr. W. Bateson, 233 

 Ferro : -magnetic Induction, The Atomic Process in. Sir 



Alfred Ewing, 444 ; -nickels. The Action of Additions 



on the Expansion Anomaly of the, P. Chevenard, 159 

 Filarial Diseases in the I'ropics, Expedition to Investigate, 



22 

 Finsbury : School of Chemistry, The, Prof. G. T. Morgan, 



154 ; Technical College, Continuance of the, 220 ; 



Correspondence Respecting the, between the City and 



Guilds Institute and the London County Council, 508 ; 



H. P. Philpot appointed Professor of Civil and 



Mechanical Engineering, and A. J. Hale Professor of 



Applied Chemistry at the, 830 

 Fireball : Large Detonating, W. F. Denning, 153 ; of 



March 2, The, W^ F. Denning, 88 

 Fireballs, Recent Brilliant, W^ F. Denning, 182 

 Fish : Herons and. Sir Herbert Maxwell, 490 ; Kept in 



Tanks and Ponds, ASn Unrecognised Cause of Disease 



in. Dr. M. Plehn, 823 ; Preservation of, by Salt, The 



Principles Involved in the, H. F. Taylor, 692 

 Fisheries, Agriculture and, in the Civil Service Estimates, 



257 

 Fishery Board for Scotland, Retirement of Dr. T. W. 



Fulton, 370 

 Fishes : Shore, L. Fage, 796 ; Studies of, 796 

 Flames, Reducing, The Principles of Analysis by Means of, 



J. Meunier, 191 

 Flat-fishes, a symmetry. Metamorphosis, and Origin of, 



H. M. Kyle. 317 

 Flax : Cultivated, The " Browning " and " Stem-break " 



Disease of. Caused by Polvspora lini, n. gen. et sp., 



H. A. Lafferty, 253 : The Pollen-'of, and the Degener- 



escence of the Varieties Cultivated for the Fibre, 



L. Blaringhem, 640 

 Flight : Dr. E. H. Hankin, 86 ; Hovering, Experimental 



Studies on, M. Idrac, 446 

 Flights, A Series of, with a Free Helicopter, E. CEhmichen, 



62 

 Flint: An Unknown Organism in, C. Carus-Wilson. 290 ; 



Implement. A Remarkable, from Selsey Bill. Sir E. 



Ray Lankester, 61 ; A Remarkable, Sir E. Ray 



Lankester, 403 ; Implements in the Cromer Forest Bed, 



J. Reid Moir, 4;8 ; Organism in, Prof. G. A. J. Cole, 



333; C. Carus-Wilson , 362 

 Floral Morphology, Studies in, No. ii.. Dr. J. M'L. 



Thompson, 93 

 Flow. The Criterion for Stable, of a Fluid in a Uniform 



Channel, Dr. H. Levy, 606 

 Flowering Plants of South Africa, The, Edited by Dr. 



I. B. Pole Evans. Vol. i.. No. i., 40 

 Fluid Motion, The Stability of. Prof. T. H. Havelock. 



29 

 Flying-fish : The " Flight " of. Sir David Wilson-Barker ; 



Prof. F. Wood-Jones. 23-? r T- S. Huxley, 267; Prof. 



W. Galloway, 376; H. 'H. Clayton, 714; Dr. E. H. 



Hankin, 707 

 Focal : Depth, Problem of Finite, revealed by Seismometers, 



