Moses Moon (1754-1822) was a Bucks County, Pennsylvania resident. He spent his entire life living and working at his family's Woodbourne Estate in Bucks County as a farmer, horticulturist and surveyor. The collection consists of what Moon called his Cyphering Book, containing drawings of the solar system, and the positions of the stars dated 1772, as well as a copy of a deed with a map on the reverse from Bucks County, Pennsylvania, dated 1787.

This volume includes definitions and problems on parabola, ellipse, and hyperbola.

Part I contains a series of definitions of the principles of physics. Part II includes chapters on the visible world, the earth, the senses, light, and meteorology.

Detailed notes from Alexander Wilson's "American ornithology," including item numbers from Peale's museum. Also two loose pages in vol. 1 attributed to John Abbot; Case for 2 volumes says "George Ord -- Birds of North America. Original manuscript."

This volume, written by an unknown author, describes general principles of physics, with numerous sketches illustrating the text. There are a few notations in Spanish by Juan Bastolleros.

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 journal was kept on a voyage from the Downs to the Capes of Delaware on board the ship Three Sisters, 26 June-20 August, 1803. The volume includes "Observations on the storm glass," made on the same voyage. The storm glass, with an explanation of its use, and the journal of observations are at the American Philosophical Society.

This volume begins with lecture number 23 (1826 December 13) and ends with number 59 (1827 February 21) of Silliman's lectures at Yale College.

This item, by an unknown author, presents an astronomical sketch of eclipses, some of which could be seen from Philadelphia and Canton, China.

A member of a family of early 19th century artists and instrument makers that included Cornelius, John, and William Fleetwood Varley, Cromwell J. Varley shared in the family interests in astronomy. The Journal of Astronomical Observations includes brief notes on telescopic observations of comets, stars, and planets conducted by Cromwell J. Varley between 1845 and 1858, accompanied by twenty ink and watercolor sketches.

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.

Kampman copied this document at the request of John Gottlieb Ernestus Heckewelder "for the information of the [American] Philosophical Society," and Heckewelder transmitted it to the Society.

Relating especially to American Philosophical Society business, these papers contain letters to and from men of science and institutions in Europe on the purchase and shipment of books and on the pubications of the Society. Many of the letters are to or from John Vaughan.

The first volume contains notes of expenses and of observations while surveying the western boundary of Pennsylvania (1785). Mentions APS under date of Feb. 20, 1784. The second volume contains observations that were continued after Rittenhouse's death to Sept. 30, 1805.

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.].

Notes kept by the Yale undergraduate John Austin Stevens on 20 lectures on natural philosophy delivered by Jeremiah Day during the fall, 1812. Includes lectures on gravitation, mechanics, and hydrostatics (hydrology), the last including theories of rivers, springs, and groundwater.

This list was kept on Smith's travels in France and Switzerland, and includes notes by John Vaughan from whose scrapbook these sheets were removed in 1959.

Treat sent this volume to Thomas Jefferson in 1809 from "Arkansa in Louisiana," and wrote, "If from their perusal you can derive, either information or amusement, respecting the climate of this part of our country, your acceptance will be highly gratifying."