Letter from William Croswell to James Scott, 1803 November 1

One-page letter from Croswell to Captain James Scott, Master of the Boston Marine Society, that accompanied Croswell's work on lunar observations.

Proposal for a treatise on arithmetic, 1803

Handwritten proposal for the printing of a treatise on arithmetic by Croswell.

Observations of Sun Spots, 1739-1743

Eleven-page notebook containing John Winthrop's handwritten observations and calculations. Titled by Winthrop "Observations of 'Spots' on ye Sun with ye Naked Eye," this is the first known record of his scientific observations and records what he saw while examining the sun "with an 8 foot telescope from 6 a.m. til sun set" on the Boston Commons and concluding with "a considerable aurora borealis" that night (April 20, 1739). It has been speculated that his reference to the aurora borealis in these observations may indicate that he recognized the interrelation of the aurora borealis and sun spots, a concept which was not definitively established until the mid-nineteenth century.

Transcription of diary entries, 1801-1803

A note indicates that White originally made these entries in his copies of the Massachusetts Register. It is unclear who prepared these transcriptions; they do not appear to be in White's hand.

Quaestiones historicae, June 21, 1803

A note indicates that these quaestiones were intended for freshmen.