MEMORIAL OF ORVILLE A. DERBY 21 



the circumstances that the geological service should have been selected as 

 the one that could be reduced without producing serious confusion in the 

 administration of the government. 



The Brazilian newspapers all speak of him in. the highest possible 

 terms, and his death is generally and properly looked on in Brazil as a 

 great national loss. 



His suicide itself was his last and his most emphatic protest against 

 the extinction of geologic work — the final culminating expression of his 

 profound interest in and devotion to the welfare of the country he had 

 served faithfully for foidry years. 



A 'list of his papers on the geology of Brazil up to 1909 is given in this 

 Bulletin, volume 20, papers 36 to 42. To that list should be added 

 the following titles, that have appeared since the publication of that list: 



Bibliography 



Feicoes physicas e geologicas do Brasil. Boletino da Directoria da Agricul- 

 tura da Bahia, volume X, pages 241-24S. Bahia, 1907. 



Service Geologico e Mineralogico do Brasil. Boletino do Ministerio da Indus- 

 trie, Yiaoao e Obras Publicas, volume I, pages 69-82. Rio, Abril de 1909. 



Os miuerios de ferro do Brasil. Jornal do Commercio, Rio, August 25, 1909. 



Early iron-making in Brazil. Engineering and Mining Journal, New York, 

 December 4, 1909. 



The iron ores of Brazil. The Times, London, December 2S, 1909, page 56. 



The iron-ore resources of the world. Stockholm, 1910, pages 813-822. 



Physical and geological features of Brazil. The Brazilian Yearbook for 1900. 

 pages 11-14. Rio de Janeiro n. d. 



Estudios geologicos en el Brasil. Santiago de Chile, 1911. (Publication of 

 the fourth congresso cientifico Latino Americano en 1908.) 



On the mineralization of the gold-bearing lode of Passagem, Minas Geraes. 

 Brazil. American Journal of Science, volume CLXXXTI, September, 1911, 

 pages 185-190. 



A notable Brazilian diamond. American Journal of Science, volume CLXXXTI. 

 September, 1911, pages 191-194. 



O aproveitamento do carvao brasileiro. Jornal do Commercio, 24 de Abril de 

 1912, page 5. 



Speculations regarding the genesis of the diamond. Journal of Geology, vol- 

 ume XX, July-August, 1912, pages 451-456. 



Observations on the stem structure Psaronius brasiliensis. American Journal 

 of Science. November. 1913, pages 489-497. 



Observations on the crown structure of Psaronius brasilicnsis. American Jour- 

 nal of Science. August. 1914. pages 149-156. 



Illustrations of the stem structure of Tietea singularis. American Journal of 

 Science, volume XXXIX, March, 1915. pages 251-260. 



