Extractus: selectissimarum rerum chymicarum, Joannis Bapt. Helmontii ab Helmond, insignis ac subtilissimi philosophi adepti lectu utilissmus

The 405 extracts, by an unknown compiler, are from the chemical writings of Helmont. The pen-and-ink manuscript is in one hand. It is undated, but the introductory biography section notes Helmont's death date, thus the compilation must be after 1644; perhaps even sometime from the 18th century.

Bound with marbled end papers in the "placard" pattern, popular from the late 17th century to the mid-18th century.