FLORA OP THE GALAPAGOS ISLANDS. 81 



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1891, pp. 217-229, 307-326. 

 (2) Ein Besuch der Galapagos-Inseln. Biolog. Centralbl. xii. 1892, 



pp. 221-250. 

 (3) New observations on the origin of the Galapagos Islands, with 



remarks on the geological age of the Pacific ocean. Am. Nat. xxxi. 



1897, pp. 661-680, 864-896 (incomplete). 

 Bentham, George. (1) Galapagos Islands. In his Notes on the classifica- 

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 Caruel, Theodor. (1) Contribuzione alia flora delle Galapagos. Rendic. 



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 Darwin, Charles. (1) In Fitz Roy, Narrative of the surveying voyages of 



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 Douglas, David. (1) A sketch of a journey to the northwestern parts of 



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 Du Petit Thouars, Abel. (1) Voyage autour du monde sur la fregate 



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 Ehrenberg, Christian Gottfried. (1) Das jetzige mikroskopische SUss- 



wasserleben der Galapagos-Inseln. Bericht Akad. Berlin, 1853, 



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 (2) Die organische Mischung der vulkanischen Gebirgsarten^besonders 



des Palagonits auf den Galapagos-Inseln. L. c, pp. 180-182 (with 



unnumbered table). 

 Engler, Adolf. (1) Versuch einer Entwicklungsgeschichte der Pflanzenwelt, 



inbesondere der Florengebiete seit der Tertiiirperiode, ii. 1882, 



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 Hemsley, William Betting. (1) Report on present state of knowledge of 



various insular floras, being an introduction to tlic botany of the 



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pp. 298-302. 



(3) The flora of the Galapagos Islands, Nature, Hi. 1895, p. 623. 



(4) Cactaceae in the Galapagos Islands. Nature, liii. 1895, pp. 31, 249. 



(5) The Cactaceae of the Galapagos Islands. Gard. Chron. ser. 3, 



xxiv. 1898, p. 265, fig. 75. 



(6) In Hook. Tconcs Plantarum, xxviii. 1901, t. 2715-2719. 



Hooker, Joseph Dalton. (1) Description of Pleurnpclnlwn, anew genus of 

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