130 APPENDIX. 



(Ersted ; and the foregoing particulars were extracted from a biographical sketch in the 

 work in question. Judging from the broken set of Liebmann's plants at Kew, it would 

 appear that the duplicates were distributed of such orders only as had been elaborated. 



John Potts. — This gentleman was manager of the mint at Chihuahua, and, in 

 conjunction with his brother Frederick, who lived on the borders of the State of 

 Sonora, he sent numerous plants, chiefly Cactacese, to Mr. F. Scheer, of Kew, between 

 1842 and 1850*. In 1845 Carl Heller accompanied Hartweg out, when the latter 

 was on his journey to California, and spent three years and a half collecting in Mexico 

 for the Horticultural Society of Vienna f , and subsequently wrote an interesting and 

 instructive narrative of his travels containing many observations on the vegetation, 

 with a special chapter on the economic plants of Mexico J. He travelled and collected 

 in Yucatan, Chiapas, and Tabasco ; but we have seen no part of his collections. A 

 portion was published by Peyritsch §. 



About the same period Dr. Alwin Aschenborn collected in Mexico, and his plants 

 were described by Nees von Esenbach and Schauer ||, together with others collected by 

 Ruhland and De Berghes. 



Anders Sandoe (Ersted. — For almost all that we know of the botany of Costa Eica 

 we are indebted to this botanist, who spent three years (1846-48) exploring that country 

 and Nicaragua, chiefly the great volcanic chain which includes the peaks of Irazu, 

 Barba, and El Viejo. He was afterwards appointed Professor of Botany in the 

 University of Copenhagen, succeeding Liebmann, whose great work on the oaks of 

 tropical America he completed and edited. (Ersted was a prolific writer on Natural 

 History, but, as in the case of Liebmann, only portions of his collections have been 

 published and the duplicates distributed ; hence the almost total blanks under many 

 natural orders observable in the general distribution-table in the next section but one 

 of this Appendix. His sketches of the vegetation of the various peaks of Costa B-ica 

 are reproduced a few pages further on. He died in 1872, at the age of fifty-seven ^f. 



Julius von Warscewiez.- — The principal objects of Warscewicz's extensive travels in 

 tropical America were humming-birds and orchids, the latter chiefly in a living state ; 

 yet he also made a general collection, though we have seen none of his plants. In 



* Seemann, Botany of the Voyage of the ' Herald,' p. 285. 



t Carl Heller, ' Beisen in Mexico,' p. 4. 



t "Versuch einer systematischen Aufzahlung der in Mexico einheimischen, unter dem Volte gebrauch- 

 lichen und cultivirten Nutzpflanzen," op. cit. pp. 395-432. 



§ " Beitrage zur Flora Mexicos," Linnsea, xxx. pp. 1-82. 



|| Linnsea, xix. p. 681, and xx. p. 697. 



f " A Biographical Sketch of the late Professor (Ersted," by E. Brown (Transactions of the Botanical Society 

 of Edinburgh, xi. 1872-73). 



