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GEOPHYSICS.— T'/ie Earth's magnetism. L. A. Bauer. Ann. Rep. 

 Smithsonian Institution for 1913, pp. 195-222, 9 p]s. 1914. 

 (Smithsonian Inst. Pub. 2281.) 

 The fourth ''Halley Lecture," dehvered in the schools of the Uni- 

 versity of Oxford on May 22, 1913; reprinted, after revision by the 

 author and with additional illustrations, from Bedrock, vol. 2, no. 3, 

 October, 1913, pp. 273-294. The lecture concerns itself especially 

 with Halley's contributions to terrestrial magnetism, to recent advances 

 relating primarily to the mapping of the Earth's magnetic field at any 

 one time, and to the determination of the secular changes. Among the 

 illustrations are a portrait of Halley, a view of the house occupied by 

 Halley while living at Oxford, and a reduced facsimile reproduction of 

 Halley's first chart of the lines of equal magnetic declination as based 

 on his observations in the Atlantic Ocean during the cruises of the 

 Paramour Pink, 1698-1700. In the closing paragraph the belief is 

 expressed that a long step forward will have been taken toward the 

 discovery of the origin of the Earth's magnetism when once we have 

 found out the causes of its many, and often surprising, variations. As 

 some slight indication of the import the solving of the riddles of the 

 Earth's magnetism may be, Schuster's suggestive remark is recalled 

 that ''atmospheric electricity and terrestrial magnetism, treated too 

 long as isolated phenomena, may give us hints on hitherto unknown 

 properties of matter." J. A. F. 



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