16 
BIOGRAPHICAL SKETCH OF 
Long to the sources of the St. Peter’s river. This task 
he undertook with that diffidence which signalized his 
real merit, expressing his regret that the unavoidable 
absence of Mr. Nuttall from the country should have 
prevented him from executing this undertaking, agreea¬ 
bly to previous arrangement, and passing on that gen¬ 
tleman a high and delicate eulogium ; how richly me¬ 
rited, this Academy needs not to be informed. 
Near the close of the same year, he also communi¬ 
cated to the Lyceum of Natural History at New York, 
a valuable paper, containing instructions for determin¬ 
ing the American species of the genus Carex, a work, 
which, though less imposing in appearance, must doubt¬ 
less have cost more intense application, and more exact 
powers of discriminating between specific characters, 
than would have sufficed for the description of many 
new species of plants. 
In 1824 Mr. Schweinitz communicated to the Ame¬ 
rican Journal of Science a short paper on the rarer 
plants of Easton, Pa., almost all of which, he remarks, 
are principally met with on the shady rocks up the 
Delaware, or at the mouth of the Lehigh. 
In the same year appeared his Monograph of North 
American Carices. Being about to embark a third 
time for Europe, this paper, together with a large col¬ 
lection of the specimens from which it had been pre¬ 
pared, was placed in the hands of his friend, Dr. 
Torrey, with a desire that it might be communicated to 
the Lyceum of Natural History, and giving him full 
liberty to use his discretion in the additions or altera- 
