172 PIONEERS OF SCIENCE IN AMERICA. 



he declined it. At the beginning of the year 1822 he removed 

 to Pennsylvania, and took up his residence in his native village 

 of Bethlehem. Here he undertook the charge of the Mora- 

 vian girls' seminary at that place, and the secular office of gen- 

 eral agent for the Brethren was retained. His botanical studies 

 were not suffered to languish. " The beautiful slopes and val- 

 leys about Bethlehem and Nazareth," says Johnson, " the ro- 

 mantic banks of the Delaware, and the precipitous rocks of the 

 Lehigh, all yielded up to him a tribute of their hitherto unex- 

 plored treasures. The high estimation set upon his works by 

 men of science had procured his election as an honorary mem- 

 ber in several societies devoted to natural history, both in 

 Europe and America. His correspondence increased, and the 

 formation of his herbarium advanced with great rapidity." 

 About this time Major Long's expedition to the sources of the 

 St. Peter's River, in the Northwest Territory, returned. It 

 had been arranged that the plants collected on this trip by 

 Thomas Say should be described by Nuttall. The work was 

 begun by this naturalist, but he was obliged to go to Europe, 

 and was prevented from returning in season to do any more. 

 The plants were accordingly put in the hands of von Schwei- 

 nitz, who described them most acceptably. 



Toward the end of 1823 the then well-known botanist com- 

 municated to the Lyceum of Natural History (now the Acad- 

 emy of Natural Sciences), of New York, a key or analytical 

 table for determining the American species of Carex the 

 largest genus of the sedges. This production, though small in 

 bulk, could result only from ample knowledge and exact dis- 

 crimination. In 1824 the American Journal of Science pub- 

 lished a short paper by him on the rarer plants of Easton, Pa. 

 There was another synod at Herrnhut this year which it was 

 necessary for him to attend, and, having a Monograph of the 

 North American Carices about completed, he put the manu- 

 script, together with a large collection of specimens, into the 

 hands of Dr. Torrey, in order that the monograph might be 

 communicated to the Lyceum of Natural History in his ab- 

 sence. He gave full liberty for making any additions or alter- 

 ations warranted by Dr. Torrey's later discoveries. When he 

 found, on returning, that his editor had made important addi- 

 tions to the number of species described, von Schweinitz, with 

 characteristic conscientiousness, requested that the paper 



