| RefNo | RB/1/38/44 |
| Previous numbers | BP 38, fol. 76 |
| Level | Item |
| Title | Part of original version of 'Usefulness'. |
| Date | 1650s or early 1660s |
| Description | Passage on making of lasting ink for inscriptions.\r\nHand: 1650s |
| Language | English |
| Extent | Fol. 76 (1 leaf) |
| Format | Manuscript |
| AccessStatus | Open |
| RelatedMaterial | Published in 'Works', vol. 13, pp. 311-12. |