Document Title: Fragment of the original version of Usefulness
Related Material: Works, vol. 6, pp. 533-4. Previously unpublished section in vol. 13, pp. 307-10
Extent: Fols. 63-4 (2 leaves)
Date: 1650s or early 1660s
Description: MS version of section of text on experiments with aqua fortis, partly published in section V of Essay X, partly unpublished (in order 64, 63).
Hand: Rounded 1650s
Physical Description: Manuscript