| RefNo | RB/1/8/21 | 
| Previous numbers | BP 8, fols. 172-9 | 
| Level | Item | 
| Title | MS version of experiment XVIII in 'Spring, 1st Continuation'. | 
| Date | 1660s | 
| Description | Missing only final paragraph, but with two paragraphs on fols. 173-4 which were not published.\r\nHand: J, some corrections by Boyle. | 
| Language | English | 
| Extent | Fols. 172-9 (8 leaves) | 
| Format | Manuscript | 
| AccessStatus | Open | 
| RelatedMaterial | 'Works', vol. 6, pp. 78-83, including hitherto unpublished material. |