250 



and Nuttall. His nephew, Dr. William P. C. Barton, also be- 

 came a well-known botanist. 



One of Dr. Barton's students, whose interest in botany seems 

 to have been first ar(3used, however, by Humphry Marshall, was 

 Dr. William Baldwin. Dr. Baldwin had already visited China 

 before he received his professional degree in 1807, and within the 

 next ten years he traveled extensively in the southern states, and 

 as a surgeon in the United States Navy visited various South 

 American ports. In 18 19 he joined a government expedition for 

 the exploration of the upper Missouri, and died before they were 

 well under way. His published papers were few, but his notes 

 and memoranda were very useful to contemporary workers, and 

 his memory is kept green by the publication of a volume of his 

 letters by his friend. Dr. Darlington. 



Dr. William Darlington was another physician who enjoyed 

 the inspiration of Barton's lectures, and in spite of his arduous 

 labors as a member of Congress and in various other public and 

 semi-public positions, devoted much time throughout a long life 

 to botanical study. His flora of his home county of Chester, 

 which went through three editions, was a model local flora which 

 in some respects has never been surpassed. He was deeply in- 

 terested m such subjects as those we are discussing this evening, 

 and it was through his efforts and under his editorship that the 

 literary relics of Bartram, of Marshall, and of Baldwin, were rescued 

 from oblivion. 



Lewis D. de Schweinitz was a Moravian preacher, a native of 

 Bethlehem, Pennsylvania, where he spent most of his life. He was 

 educated in part, however, in Austria and Germany ; although 

 his study of botany was begun before he left America, his first 

 published work was in collaboration with Professor J. B. Alber- 

 tini, of Niesky, in upper Lusatia. His chief interest was in cryp- 

 togamous plants, particularly fungi, and he was the first American 

 specialist in this group of plants. Although his published works 

 were few, they were fairly voluminous, and are of great importance. 



The leader of the New York group of botanists was Dr. Sam- 

 uel L. Mitchill. He was a naturalist of broad interests, and 

 never published any botanical work of consequence, yet he ex- 



