[001] John Biddle, a Pennsylvanian, entered the army July 6, 1812, as second lieutenant in the 3d Artillery. In March following he became first lieutenant, and in the succeeding October captain in the 42d Infantry. He was transferred to the artillery corps in 1815, made major and assistant inspector-general in 1817, and disbanded in 1821. He was in Long's party only during the first season. William Baldwin (1779-1819), also of Pennsylvania, was the son of a minister of the Society of Friends. He studied medicine in the University of Pennsylvania, taking his degree in 1807. Meanwhile he had become interested in botany, and upon locating at Wilmington, Delaware, to practice his profession, studied assiduously the flora of the vicinity. In 1811 ill-health compelled him to remove to Georgia, but during the War of 1812-15 he served as a surgeon in the army. In 1817 he was a member of the special commission sent by the federal government to investigate the affairs of the Spanish-American colonies, then struggling for independence. Some of Dr. Baldwin's writings were published in the _Transactions_ of the American Philosophical Society and _Silliman's Journal_. He died while upon the present expedition, and a further sketch will be found in the text, _post_. Thomas Say (1787-1834) was also the son of a Pennsylvania Friend, Benjamin Say, a physician, and one of the "fighting Quakers" of the Revolution. Thomas was one of the founders of the Academy of Natural Sciences at Philadelphia, and before joining Long's expedition had taken part in a scientific exploration of the coasts of Georgia and Florida. He accompanied Major Long upon his later expedition up St. Peter's River. In 1825 he joined the colony under Robert Dale Owen, at New Harmony, Indiana. His principal work was _American Entomology_ (Philadelphia, 3 vols., 1824-28). He is said to have discovered more new species of insects than any predecessor, many of them being discovered during the present exploration. Augustus Edward Jessup was born at New Richmond, Massachusetts, in 1789, and although known chiefly as a prosperous Philadelphia business man, was much interested in science, being an early member of the Philadelphia Academy. He remained with the expedition during the first season only. Titian Ramsey Peale (1800-1885) came of a family which has produced a remarkable number of artists, the most notable being a brother, Rembrandt. His father, an uncle, another brother, and three cousins achieved more or less distinction in that field. Like his father and brother, T. R. Peale divided his attention between art and natural science. He was an officer of the Philadelphia Academy, and author of _Mammalia and Ornithology_ (1848). From 1838 to 1842 he was a member of Lieutenant Charles Wilkes's exploring expedition to the South Sea; during the years 1849-72 he was an examiner in the patent office.