Nature, 1 



Sct>tember 29 



Index 



IX 



Clark (Dr. W. M.), The Determination of Hydrogen Ions, 



772 

 Clarke (F. W.), and W. C. Wheeler, The Inorganic Con- 

 stituents of Marine Invertebrates, 795 

 Clarke (G. A.), An Unusual Pilot-balloon Trajectory, 30; 



Clouds, 365 

 Clarke (Dr. W. Eagle), retirement from the Keepership of 



The Natural History Department of the Royal Scottish 



Museum, 243 

 Clarke (Miss Winifred S.), appointed Lecturer in Education 



in Manchester University, 507 

 Claude (G.), Process for the Synthesis of Ammonia, 765 ; 



The Manufacture of Hydrogen for the Synthesis of 



Ammonia, 351 ; The Synthesis of Ammonia under very 



High Pressure, 93 

 Claxton, Report of ihe Royal Observatory, Hong-Kong, 



1920, 824 

 Clayton (A. E.), Harmonic Analysis, 759 

 Clayton (H. H.), Solar Radiation in Relation to Faculae, 



108; The " Flight " of Flying-fish, 714 

 Clerc (L.-P.), Applications de la Photographic A6rienne, 167 

 Clerici (E.), New Mineral Deposit near Rome, 127 

 Clifton (Prof. R. B.) [obituary article], 18 

 Coates (H.), Fall of Meteorites in Perthshire, 632 

 Cobbett (Dr. L.), re-appointed University Lecturer in 



Pathology in Cambridge University. 507 

 Coblentz (Dr.), The Present Position of our Knowledge of 



the Laws of Radiation of a Perfectly Black Body, 344 

 Coblentz (W. W.), The Spectrophotoelectrical Sensitivity of 



Proustite, 694 

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



10 • Waste Oil from Ships, 333 

 Cohen (Prof. E.), and Dr. W. Schut, Piezochemie konden- 



sierter Systeme, 450 

 Cohen (Prof. J. B.), Pure Organic Chemicals, 12 

 Coker (Prof. E. G.), K. C. Chakko and M. S. Ahmed, 



Contact Pressures and Stresses, 280 

 Cole (Prof. G. A. J.), Organism in Flint, 333 ; The Problem 



of the Bray Series, 510 

 Coleman ("L. C), The Cultivation of the Millet " Ragi " in 



Mysore, 58 

 Collard (A.), " L'Astronomie et les Astronomes," 503 

 Collie (Prof. J. Norman), elected a Member of the Athenaeum 



Club, 213 

 Collinge (Dr. W. E.), appointed Keeper of the York 



Museum, 60 ; The Scarcity of Swallows, 628 

 CoUis (Prof. E. L.), and Dr. M. Greenwood, The Health of 



the Industrial Worker. Containing a Chapter on Re- 

 clamation of the Disabled, by Dr. A. J. Collis, 354 

 Colwell (H.), History of Electrotherapy, 150 

 Comessatti (A.), Geometric Theory of Binary Forms, ii., 



127; iii., 128 

 Comissopulos (N. A.), and J. Wadsworth, Variability of 



Temperature over Europe and North America (1900-9), 



605 

 Comrie (L. J.), elected to an Isaac Newton Studentship in 



Astronomy in Cambridge University, 123 

 Contremoulins (G.), The Protection against X-rays of 



Persons other than the Operator and Patient, 382, 



414 

 Conway (Prof. R. S.), New Studies of a Great Inheritance ; 



Being Lectures on the Modern Work of some Ancient 



Writers, 744 

 Cook (Dr. G.), appointed Professor of Mechanical Engineer- 

 ing at King's College, London, 572 

 Cook (Dr. M. T.), College Botany : Structure, Physiology, 



and Economics of Plants, 807 

 Cooke (A.), Groundwork of Surgerv (for First-year Students), 



807 

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



745 



Copaux (Prof. H.), translated by Dr. H. Leffmann, Intro- 

 duction to General Chemistry, 743 



Copeland (Prof. E. B.), The Coco-nui. Second edition, 391 



Coronas (Rev. J.), The Climate and Weather of the Philip- 

 pines, 1903 to 1918, 732 



Cortie (Rev. A. L.), Report of the Stonyhurst College 

 Observatory, 503 ; The Great Sun-spot Group and Mag- 

 netic Disturbances, May 8-21, 426 



Cory (C. B.) [obiuiary], 820 



Cossor (A. C), and Son, The Origin of " Churning at 

 62° " on Dairy Thermometers, 362 



Coste (J. H.), Earthworms drowned in Puddles, 360 ; Why 

 do Worms Die?, 491 



Cotton (Dr. L. A.), The Kurrajong Earthquake of August 

 15, 1919, 832 



Coulter (Prof. J. M.), elected a Foreign Member of the 

 Linnean Society, 369 



Coupin (H.), A Stem with Horizontal Geotropism, 159 



Courmont (P.), A. Rochain, and F. Laupin, The Disap- 

 pearance of Pathogenic Germs in the Course of the 

 Purification of Sewage by Activated Sludge, 735 



Couvreur (E.), and X. Chahovitch, .A Natural Mode of 

 Defence against Microbe Infections in the Invertebrates, 

 191 



Coville (F. v.), The Influence of Cold in Stimulating the 

 Growth of Plants, 223 



Coward (T. A.), elected President of the Manchester Literary 

 and Philosophical Society, 342 ; The Birds of the British 

 Isles and their Eggs. Second series, 40 



Cowley (W. L.), and Dr. H. Levy, Aeronautics in Theory 

 and Experiment. Second edition, 389 



Craig (Dr. J.), Knighthood conferred upon, 277 



Crawford (Prof.), and Miss Levy, Pons-Winnecke's Comet, 



405 



Crawford (O. G. S.), Iron Currency-bars, 587 



Crewe (H. T.), The Practical Electrician's Pocket Book 

 for 192 1, 232 



Crewe (Lord), The Universities and Technological Educa- 

 tion, 656 



Cridland (Miss Dorothy), awarded a Scholarship by the 

 Anglo-Swedish Society, 411 



Crocco (Col. G. A.), Utilisable Energy of the Wind, 478 



Crocker (Prof. F. B.) [obituary], 721 



Crommelin (Dr. \. C. D.), Meteors on the Moon, 235; 

 The Annular Eclipse, 211 



Crook (T.), Economic Mineralogy : A Practical Guide to 

 The Study of Useful Minerals, 646 



Crookshank (Dr. F. G.), The Ethnological Significance of 

 Mongolian Imbecility, 218 



Crossland (C), The Proposed University of Jerusalem, 733 



Crowther (Dr. J. A.), appointed University Lecturer in 

 Physics as applied to Medical Radiology in Cambridge 

 University, 572 ; re-appointed a Demonstrator in Ex- 

 perimental Physics, Cambridge University, 830 



Crowther (W. L.), and C. E. 'Lord, The Osteological Speci- 

 mens in the Tasmanian Museum, 116 



Cruttwell (G. E. W.), A Model for Investigating the Move- 

 ments in the River Thames between Teddington and 

 Shoeburyness, 596 



Cullen (Rev. J.), An Algebraical Identity, 587 



Culpin (Dr. M.), Spiritualism and the New Psychology : 

 An Explanation of Spiritualist Phenomena and Beliefs 

 in Terms of Modern Knowledge, 164 



Cumpston (Dr. J. H. L.), Accuracy in Medicine, 441 



Cunningham (Dr. Brysson), Bull and Meare's Second Report 

 on the Water-power Resources of India, 263 ; Hydrology 

 of the Western States of North America, 406 ; Inland 

 Waterways, 48 



Cunningham (E.), Relativity : The Electron Theory and 

 Gravitation. Second edition, 742 



Curie (Mile. Ir^ne), The Atomic Weight of Chlorine in some 

 Minerals, 382 



Curie (Mme.), presentation to, of a Gram of Radium, 402 ; 

 The -y-Radiation and the Evolution of Heat from 

 Radium and Mesothorium, 382 



Currie (Sir Arthur), The Universities and Technological 

 Education, 656 



Curtis (Sir G.), The Development of Bombay, 757 



Gushing (Dr. H. P.) [obituary], ^4I 



Cushman CR. A.), The Ichneumon-flies of the Tribe 

 Ephialtini, 533 



Cusmano (G.), intermolecular Condensations produced by 

 Oxynitric Groups, 127 



Czaplicka (Miss), [obituary], 466 



Dale (Sir Alfred W. W.), [obituary], 790 



Dale (G. H. C), Map Reading, 775 



Dalton (O. M.), appointed Keeper of the Department of 



