[38] Peter D. Knieskern, M. D., 1798-1871. “Botanized over the pine-barrens of New Jersey with utmost assiduity and skill, a simple-hearted, unpretendingly good and faithful man.... Few botanists have excelled him in their knowledge of the plants of the region in which he resided, and none in zeal, simplicity, and love of science for its own sake.”—A. G.
[39] Thomas Nuttall, 1784-1859; a great traveler and explorer. Came to the United States in 1807. His writings are intimately connected with the development of North American botany.
[40] Robert K. Greville M. D., 1794-1866; author of Scottish Cryptogamic Flora, Flora Edinensis, and Algæ Britannicæ.
[41] Robert Graham, M. D., 1786-1845; professor of botany in the University of Edinburgh.
[42] William Nicoll. Invented section-cutting of recent and fossil woods in 1827.
[43] James Forbes, 1809-1861; professor of natural philosophy in the University of Edinburgh.
[44] Robert Jameson 1774-1854; professor of natural history in the University of Edinburgh.
[45] John Hutton Balfour, M. D. 1808-1885; professor of botany in Glasgow, and afterwards in the University of Edinburgh.
[46] Sir Charles Bell, 1774-1842; a very distinguished surgeon; author of Anatomy of Expression and many celebrated works. He accepted the chair of surgery at Edinburgh, 1836.
[47] John Abercrombie, M. D., 1781-1844; celebrated Scotch physician and author.