Théorie & Symboles Des Alchimistes : Le Grand-Oeuvre, Suivi d'un essai sur la bibliographie alchimique du XIXe siècle / Albert Poisson
Figure I (Margarita pretiosa).
The gold matter of the Stone is enclosed in the sepulcher or the philosophical egg. But from the moment it is enclosed there, it begets a son, that is to say, a new body is produced; the alchemist buries both the father and the son (See Chapter V).
Figures II and III (Liber singularis by Bacchusen).
Two sealed philosophical eggs, containing the Matter of the Stone, gold and silver. In one, there is sublimation, indicated by the bird rising. In the other, the sublimated matter has precipitated or condensed, indicated by the bird descending (See Chapter VI).
The Rosarium philosophorum, c. 1550
"Here is born the noble and rich Empress
The masters call her their daughter alike.
She multiplies / gives birth to children without number /
She is eternally pure / and without any flaw."