GEOLOGY. 231 



*Monografias geologicas, 1881-1885 ,md 1884-1885; 1881-1885, 

 Memorias sobre los temblores de tierra ocurridos en Julio 

 1880, estudio geologico del Volcan de Taal, noticia acerca 

 de los manantiales termo-miiierales y de las salinas del Monte 

 Blanco en la provincia de Nueva Vizcaya by Jose Centano 

 y Garcia; 1884-1885, Terremotos de Nueva Yizcaya, Fili- 

 pinas, en 1881, informe acerca de ellos seguido de unos puntos 

 fisicos y geologicos tornados en el viaje de Manila a dicha 

 provincia, el Monte Maquilin y sus actuales emanaciones, el 

 Mayon 6 volcan de Albay, emanaciones volcanicas subordi- 

 nadas al Malinao, la Isla de Biliran y sus azufrales by Enrique 

 Abella y Casariego. 



*Monographs of the U. S. Geological Survey, prepared under the 

 direction of J. W. Powell and Charles D. Walcott, directors, 

 nos. 17-30, 1891-1898. 



No. 17. Flora of the Dakota group by Leo Lesquereux, edited by 



F. H. Knowlton, 1891. 



No. 18. Gasteropoda and Cephalopoda of the raritan clays and green- 

 sand marls of New Jersey by Robert Parr Whitfield, 1891. 

 No. 19. Penoke iron-bearing series of Michigan and Wisconsin by 



Roland Duer Irving and Charles Richard Van Hise, 1892. 

 No. 20. Geology of the Eureka district, Nevada, with atlas by 



Arnold Hague, 1892. 

 No. 21. Tertiary Rhynchophorus Coleoptera of the United States by 



Samuel Hubbard Scudder, 1893. 



No. 22. Manual of topographic methods by Henry Gannett, 1893. 

 No. 23. Geology of the Green Mountains in Massachusetts, by 



Raphael Pumpelly, J. E. Wolff and T. Nelson Dale, 1894. 

 No. 24. Mollusca and Crustacea of the Myocene Formations of New 



Jersey, by Robert Parr Whitfield, 1894. 

 No. 25. Glacial Lake Agassiz by Warren Upham, 1895. 

 No. 26. Flora of the Amboy clays by John Strong Newberry, edited 



by Arthur Hollick, 1895. 

 No. 27. Geology of the Denver basin in Colorado by Samuel Franklin 



Emmons, Whitman Cross and George Homans Eldridge,, 



1896. 

 No. 28. The Marquette iron-bearing district of Michigan, by Charles 



Richard Van Hise and William Shirley Bayley including 



a chapter on the Republic trough by Henry Lloyd Smyth, 



1897. 



No. 29. See above, atlas, 1896. 

 No. 30. Fossil Medusae by Charles D. Walcott, 1898. 



