52 



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369, 432-477, 478 ; Les Mondes, xv, pp. 17-24 ; Archives Sci. Phys. 



Nat., xxxi, 1868, pp. 5-14 ; C. X., iii, 1868, pp. 225-231; Roy. Instil. 



Proc., v, 1869, pp.178-185 ; Smithsonian Reports, 1869, pp. 182-207. 

 Sur la formation des gypses et des dolomites. C. R., Ixiv, pp. 815-817. 

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On Some Points in the Geology of Vermont. S. J., xlvi, pp. 222-229. 

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V r olcanoes and Earthquakes. C. N., iv, pp. 387-397. 



The Magnetic Iron Sands of Canada. C. N., iv, pp. 467-469. 



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324 ; S. J., xlix, 1870, pp. 153-157. 



