| RefNo | RB/1/38/51 |
| Previous numbers | BP 38, fols. 85-6 |
| Level | Item |
| Title | MS version of introduction to `Essay XIII' of 'Usefulness' |
| Date | 1660s |
| Description | Copied out in BP 28, pp. 293-96 and again in BP 24, pp. 375-85.\r\nHand: F |
| Language | English |
| Extent | Fols. 85-6 (2 leaves) |
| Format | Manuscript |
| AccessStatus | Open |
| RelatedMaterial | See 'Works', vol. 13, p. lv. |