Seven treatises on mathematical and astronomical subjects bound together into one volume, dated c. 1550-1672 and 1750s, 91 folios. The treatises were added to the collection at G.B. Airy's direction, and there is a contents list in his hand.

1. 'Cono Cuneus ... By John Wallis ... 1662', an incomplete copy of the English original of a Latin treatise published in Wallis's 'Opera Mathematica', Vol. 2 (1693), pp. 679-704.

2. Diagrams showing 'A view of the Curves made by the application of the sines, Tangents and secants of a Circle'.

3. Mathematical notes about the grinding of lenses, in an unidentified mid-17th century hand, possibly that of William Gascoigne.

4. Five chapters of a work on lunar calculations, with two of another on the Moon and lunar and solar eclipses, in an unidentified hand.

5. 'The figures of the eclipsis of the sonne and the mone Withe the trew supputacion of the tyme for the situatyon of London', in a 16th century hand.

6. 'Moone-Diall ... for all lovers of the Mathematicks After which is placed an Appendix with ... Questions touching the motion of the Suns shadow by Gerard Kinckhuysen junior. Printed Anno Domini 1645', probably translated by Immanuel Halton, transcribed by 'W. M.', 1672.

7. A rough draft discussing an astronomical method of finding longitude, marked in pencil 'Methodus Longitudinum promota auctore Tobia Mayero' ('A method of longitude ... by Tobias Mayer'), c. 1750s. There is a single sheet containing Flamsteed's notes on an eclipse of 1671 (possibly part of RGO 65I).