Note 140 — Chapter IV · THE ALCHEMICAL STUDIES OF SCOT
Reading edition
For example, ‘quaedam gumma quae invenitur in alumine de pluma, et ista gumma est rubea, et gumma quae invenitur in alumine rubeo et ista gumma est preciosa et bona valde.’ The word becomes intelligible when read as ‘gemma.’