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840 Wilson (Herbert M.). Porto Rico; its topography and aspects. 
Am. Geog. Soc, Bull., vol. 32, pp. 220-238, with map, 1900. 
Describes physiography of the island. 
841 Winchell (Alexander N.). Etude mineralogique et petrogra- 
phique des roches gabbroiques de l'Etat de Minnesota, 
Etats-Unis, et plus special ement des anorthosites. 
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Abstract: Am. Jour. Sci., 4th ser., vol. 11, p. 89 (J p.), 1901. 
842 Note on certain copper minerals. 
Am. Geol., vol. 28, pp. 244-246, 1901. 
Describes occurrence of chalcopyrite and bornite at Butte, Mont. 
843 Winchell (Newton H.). Glacial lakes of Minnesota. 
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Describes the retreat of the ice sheets and the occurrence of the 
several glacial lakes of the region. 
844 [Reviews of "A Text-book of important minerals and rocks, 
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Tillman, and "The progress of Mineralogy in 1899, an 
analytical Catalogue of the contributions to that series II 
during the year," by S. H. Hamilton and J. R. Withron, 
and " New species of Cambrian fossils from Cape Breton," 
by G. F. Matthew]. 
Am. Geol., vol. 27, pp. 48-49, 1901. 
845 [Review of "La Face de la Terre" (Das Antlitz der Erde), 
by Ed. Suess, and Bulletin of the Hadley laboratory of 
the University of New Mexico, vol. 2, pt. 1]. 
Am. Geol., vol. 27, pp. 56-59, 1901. 
846 - — [Review of Bulletin No. 4 of the South Dakota School of 
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Am. Geol., vol. 27, p. 124 (£ p.), 1901. 
847 [Reviews of "Profiles of Rivers in the United States," by 
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Am. Geol., vol. 28, pp. 56-57, 1901. 
848 [Reviews of "Die Ursachen der Oberflachengestaltung des 
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Am. Geol., vol. 28, pp. 123-127, 1901. 
