Document Title: Part of introduction to unpublished 'Essay XIII' of Usefulness.
Related Material: Published in Works, vol. 13, pp. 350-2. See also BP 9, fols. 162-3, BP 24, pp. 375-85, BP 28, pp. 293-5 and BP 29, fols. 207-18.
Extent: Fols. 27-8 (2 leaves)
Description: Continued from BP 28, pp. 293-6.
Hand: E, corrections by Boyle?
Physical Description: Manuscript. There is a little flap sticking up with the words 'Mutuall Usefulness' on it.