The strength of the keel boat’s contribution to the community lay in special scientific knowledge; and if Owen’s inclination toward socialism had been increased by the success of Rapp’s submissive peasants, he erred gravely in his own choice of followers. William Maclure (1763-1840) was a wealthy Scotchman, who turned from a successful mercantile career to the natural sciences. He first visited the United States in the last years of the eighteenth century, and planned a geographical survey of the whole country. He explored at his own expense a vast territory, and prepared maps showing the result of his investigations. He was a founder of the Academy of Natural Sciences, at Philadelphia, to which he gave generously of his fortune, and was its president for more than twenty years. His friend, Thomas Say (1787-1834), called “the father of American zoölogy,” was also connected with the Academy in its formative years. The place of both is secure in the history of American science. Lesueur came to the United States from the West Indies. His scientific researches had included extensive investigations in Australia, and he was an early, if not indeed the first, student of the Mound-builders’ remains in Indiana. He was an artist of considerable merit, and some of his work may be seen in the New Harmony library. Troost (1776-1850) was a scientist of wide and exact knowledge, who went to Tennessee after the collapse of New Harmony, taught the sciences for many years in the University of Nashville, and was for eighteen years State geologist. Neef was a native of Alsace. He had been a teacher in Pestalozzi’s school, in Switzerland, and met there his wife, who was educated under the direction of Madame Pestalozzi. They removed to Philadelphia immediately after their marriage, and became acquainted with Maclure, who, like Owen, had been attracted by the Pestalozzi system, and who persuaded them to join the Owenites. Little is known of Macdonald, though there is a tradition at New Harmony that he returned to Scotland and inherited a title of nobility.