. THE BOTANISTS OF PHILADELPHIA. 131 



De Schweinitz presented to the Lyceum of Natural History at 

 New York, a paper containing instructions for determining 

 the American species of carex. In 1824 he published in 

 the American Journal of Science a short paper on the " Rarer 

 Plants of Easton, Pennsylvania."* In this year, also, his 

 " Monograph of North American Carices " f appeared, but 

 previous to its publication, he had placed it in the hands of 

 Torrey, De Schweinitz having been called for the third time 

 to Europe. He said, on his return, that " the judicious and 

 elaborate amendments he had proposed, and the mass of 

 new and valuable matter he had added, entitled Dr. Torrey 

 to a participation in the authorship of the work." 



While he was absent (in 1824) in Europe, his paper, 

 " Descriptions of a Number of New American Species of 

 Sphaeria," was published by the Philadelphia Academy of 

 Sciences. He continued his mycological work on his return, 

 having given up the superintendency of the- literary 

 institution. He devoted his leisure time to his synopsis of 

 North American fungi ( *' Synopsis Fungorum in America 

 Borealia Media Digentum " ), designed for a European 

 journal, but published in the Transactions of the Philo- 

 sophical Society at Philadelphia, in 1831. His health, 

 heretofore, very good, now began to fail. The great amount 

 of work and care on account of his official station, and the 

 composition of a dissertation on the affairs of his community 

 deprived him of his usual out-door exercise, depressed his 

 cheerful spirit and fatally undermined his health. A trip 

 to Indiana on church duties seemed to revive him for a 



* List of Rarer Plants Found Near Easton, Pennsylvania, 2 pp. 8 vo. Silli- 

 man's Journal, VIII, p. 267. 



1 1824. A Monograph of the North American Species of the Genus Carex. 

 Edited by John Torrey. New York. Octavo p. 283-373, 6 tab. Annals of New York 

 Lyceum. I, p. 283. 



