This volume is a record of a schoolboy's life in Switzerland, with comments on his life in Passy with his grandfather, Benjamin Franklin.

These papers include correspondence from over 180 individuals, lecture notes and essays on mathematics, astronomy, and electricity, and his diaries from journeys through Germany (1798) and Switzerland (1802).

These two diaries were kept by Amelia Smith Calvert on trips to Europe with her husband Philip Powell Calvert. They record little scientific information, although there is mention of some of the entomologists and scientists whom they met (e.g. Professor Robert Newstead of University of Liverpool). In general, her observations are those of a literate and passionate sightseer who records travel events in great detail. The British diary (1912) includes descriptions of Liverpool, Edinburgh, York, Lincoln, Cambridge, Oxford, and London, and observations of the entomological specimens they saw in London. The Europe diary (1929) includes descriptions of Antwerp, Brussels, Amsterdam, Lucerne, Venice (of particular interest), Padua, and Milan. There is a description of P.P. Calvert's examination of insect specimens in the collection of Baron de Sélys-Longchamps in the Institut royal des sciences naturelles de Belgique.

Letters of a dutiful child to his parents Richard Bache and Sarah Franklin Bache, and to his grandfather, Benjamin Franklin; also letters to William Jones, Robert Frazer, and Margaret H. Markoe, his fiancée. Also photostats of letters to Robert Alexander of Virginia, from the originals in University of Virginia Library.

The natural historian Richard Harlan was a pioneer in the study of comparative anatomy and vertebrate paleontology in the United States during the years following the War of 1812. Having received his medical degree from the University of Pennsylvania in 1818, Harlan was employed as an instructor of anatomy at Joseph Parrish's school and at the Philadelphia Museum. A practicing physician and member of the Academy of Natural Sciences of Philadelphia and the American Philosophical Society, Harlan made important contributions in comparative neuroanatomy, paleontology, herpetology, and systematic zoology. He died shortly after moving to New Orleans in 1839. Harlan's journals document two of the three overseas voyages he undertook during his lifetime. The first took place in 1816-1817 when Harlan was still a medical student, accompanying an East Indiaman to Calcutta as ship's surgeon. The second took place when Harlan was at the peak of his career in 1833, venturing to England, France, and Italy to strengthen contacts with European colleagues. Interesting travel narratives in themselves, the journals mingle enthusiasm for the new and exotic with a touch of Harlan's truculance. The European journal includes a valuable account of the 3nd meeting of the British Association for the Advancement of Science at Cambridge at which Harlan delivered a paper on fossil reptiles.

After a brief career in the Congregational church, J. Peter Lesley (1819-1903) left the ministry in 1852 to work full-time as a geologist. Having gained experience in structural geology and stratigraphy with the First Pennsylvania Geological Survey (1836-1842), Lesley became an expert in the geology of coal, working for the Pennsylvania Railroad and other corporations and conducting some of the first systematic studies of the state's hydrocarbon resources. A long-time professor at the University of Pennsylvania, he was elected to the APS in 1856, serving variously as its librarian, secretary, and vice president, and he was selected as Director of the Second Pennsylvania Geological Survey (1875-1889). The Lesley Papers include letters to and from Peter Lesley and his wife, Susan on geology, coal and iron mining, abolition, educational reform, organized charity, and Unitarianism. The collection offers important insight into academic and applied geology in late 19th century Pennsylvania, the development of the coal and iron industries, as well as into the Lesleys' progressive social and intellectual milieu. It is divided into three series: Lesley's general correspondence, his correspondence with his brother Joseph, and microfilms of Lesley's research notes.