. La découverte. La science. Découverte d'un journal populaire MENSUEL DE CONNAISSANCES Vol. mauvais, n° 29. Mai 1922. Le prix est. NET. La découverte. Un journal populaire mensuel de connaissance. Édité par Edward Liveing, B.A., Rothersthorpe. Northampton, à qui tous Editorial Communication doit être adressée. (M. A. S. Russell continue à agir en tant que conseiller scientifique.) Publié par John Murray, 50A Albemarle Street, Londres, W.i, à qui toutes les communications doivent être abordées. Publicité : Bureau 34 Ludgate Chambers, 32 Ludgate Hill, Londres, E.C.4. Abonnement annuel, 125. 6 d. ; libre après les chiffres, 15.

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. Discovery. Science. DISCOVERY A MONTHLY POPULAR JOURNAL OF KNOWLEDGE Vol. Ill, No. 29. MAY 1922. PRICE Is. NET. DISCOVERY. A Monthly Popular Journal of Know- ledge. Edited by Edward Liveing, B.A., Rothersthorpe. Northampton, to whom all Editorial Communications should be addressed. (Dr. A. S. Russell continues to act as Scientific Adviser.) Published by John Murray, 50A Albemarle Street, London, W.i, to whom all Business Communications should be addressed. Advertisement Office: 34 Ludgate Chambers, 32 Ludgate Hill, London, E.C.4. Annual Subscription, 125. 6d. post free ; single numbers, 15. net ; postage, 2d. Binding cases for Vol. 11, 1921, are now ready. Price 25. 6d. net each ; postage gd. liow great is the part played by " chimneys " in these fogs. A problem, however, which has never hitherto been satisfactorily cleared up, is their very sudden development, particularly in London. How many times has one not woken, especially during the " season of mists and mellow fruitfulness, " to a clear, blue sky, only to find oneself three or four hours later plunged into the gloom of a " pea-soup " fog ? To how great an extent " the quantity of smoke emitted during this time in London is sufficient to account for the quantity of impurity found in the fog, " i.e. for the density of the fog, is discussed by Dr. J. S. Owens in a paper in the latest report on Atmospheric Pollution ' issued by the Meteorological Office, Air Ministry. Editorial Notes In this number Professor Alfred Wegener gives his first account in English of his theory of the origin of the continents and oceans. It has as yet received very little attention in this country on account of the difficultv of obtaining German publications during the war. Professor Wegener first put forward his theory in 1915, and repubUshed it in 1920 imder the title " Die Entstehung der Kontinente und Ozeane " (" The Origin of the Continents and Oceans "). We must leave th

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