150 THE BOTANISTS OF PHILADELPHIA. 



in the line of duty, he made a journey to Paris in 1827, 

 where he formed the acquaintance of many of the most 

 eminent men of science there, and with whom he subse- 

 quently kept up a correspondence. In 1832 or 1833 he 

 resigned his commission in the army, and lived the retired 

 life of an invalid in New York, until 1852, when he moved 

 to Philadelphia. 



His contributions to botanical and zoological science 

 were published mostly in the Annals of the Lyceum of 

 Natural History of Neiu York, and in the Proceedings of 

 the Acad&iuy of Natural Sciences of Philadelphia, from 

 1852 to 1860. His extensive and valuable herbarium, 

 wdiich had been carefully reviewed by the older botanists of 

 the country, was presented to the Academy of Natural 

 Sciences of Philadelphia in 1852, and was followed shortly 

 after his death by a large collection of fresh water mollusca 

 of the United States, containing many original specimens 

 of species first observed by him. 



No separate botanical work bears his name as author, 

 nor any in zoology that we know of, except one on 

 American Lepidoptera, published in connection with M. 

 Boisduval. But the Eoyal Society's " Catalogue of Scientific 

 Papers " records the title, place and date of publication of 

 thirty-five of them, eleven of which are botanical. Several 

 of these are monographs. The earliest on the " United States 

 Species of Paspalum," was published in the year 1820 ; three 

 others, namely, those on Utricularia, Gratiola and Ruellia, all 

 in 1824; those on Tillandsia and Viola in 1826; that on 

 Pancratium in 1828. He was a keen but leisurely observer 

 and investigator, and still more leisurely writer. He was 

 a man of very refined and winning manners, of scholarly 



