These volumes contain calculations and drawings of an eclipse of the sun, 24 June 1778, and of the moon, 29 May 1779, adjusted to the meridian of Philadelphia. There is also an incomplete duplicate of the calculations for the sun, and a duplicate of the calculations for the moon. An apparently personal reference in the text suggests that Freehauff was a native of Germany.

This essay discusses Priestley's experiments concerning phlogiston, also called "the principle of inflammability," which was once thought to be a volatile substance that was part of all combustible matter and was released as flame in combustion.

This small volume records excerpts from British natural philosophy and scientific journals, written sometime after 1799. It covers a wide range of subjects, from astronomy to zoology.

The first volume contains mathematical problems, which appear to be college exercises (1814); the second volume is an essay on the projection of the sphere and spherical trigonometry, including an appendix on astronomy (1812); and the third volume is a lecture on natural philosophy, apparently prepared for delivery [n.d.].

This work contains some material on electricity. There are also 14 plates, representing the essential elements of mathematics, physics, and cosmography.

An early Welsh emigrant to Pennsylvania, David Evans was educated at Yale (1713) before answering the call to Presbyterian pulpits in the Welsh Tract of Delaware and Pennsylvania, and to the church at Pilesgrove, N.J. Written entirely in Latin in 1747 when Evans was 66 years old, the Aliquot Rudimenta Physicae consists of four separate compendia bound together, the Compendium Technologiae, Logicae, Rhetoricae, and Physicae. The work is an interesting and thorough attempt to summarize a system of knowledge with impeccable American provenance.

This treatise includes experiments on eletricity (with mentions of B. Franklin), ballooning (mentions of J. P. Blanchard), pharmacology, chemistr, and hydraulics. Included is a sketch of Woulfe's bottle for passing gases through liquids (Peter Woulfe, 1767).

There are botanical notebooks which concern Bunbury's study of fossil plants in general, with special studies on the fossil plants in the Geological Society in Richmond, Virginia, and at Aix-la-Chapelle, Cape Breton Island, and Pennsylvania. There is also a historical sketch of eminent English naturalists.

Personal and professional correspondence of the chemist Robert Hare, including drafts of letters to editors of journals on such varied topics as fish guano, slaughterhouses, paper money, and the meaning of the term "Yankee annexations." The collection originally contained over 300 scrolls, since disbound, which contained drafts of letters, essays, and lectures, composed by Hare on ordinary sheets of paper, then pasted end to end, and rolled up. The essay and lecture topics include: chemistry, storms, slavery, currency, fire-fighting, capital punishment, railroads, the Smithsonian Institution, Michael Faraday, religion and Spiritualism, riots in Philadelphia, epidemics, underwater blasting, and Ralph W. Emerson; there is some verse. The collection also contains an account book of Hare and his wife, 1806-1829 (180 pp.; B/H22#3); a volume by Hare on Cyclones (tornadoes), n.d. (ca. 60 pp.; B/H22#4); and Samuel Powel, Jr.'s "Short notes on a course of antiquities at Rome... under M. Byre Antiquarian," 1764. (60 pp.).