VELOCITY OF ELASTIC WAVES IN GRANITE 71 
'R. A. Daly, “Nature of Certain Discontinuities in the Earth”, Bulletin of the Seismo- 
logical Society of America 20, 41-52 (1930), Stanford. 
* Harold Jeffreys, “The Earth: Its Origin, History, and Physical Constitution”, 2nd 
Edition, Cambridge University Press, 346 pages, 3 plates, 16 figs., index (1928). Price $5.50, 
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64, (1931), Gottingen. 
8 A. E. H. Love, “A Treatise on the Mathematical Theory of Elasticity”, Published by 
Cambridge University Press, Fourth Edition, 643+-xviii pages (1927). Price 40 s. net. 
* Ch. Maurain, L. Eblé, and H. Labrouste, “Sur Sismiques des Explosions de la Cour- 
tine”, Journal de Physique et la Radium 6, 65-78 (1925). 
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