Definition of Gain in Partnership as Derived from Labor

Notes

1. §17.2.8.prcuius — The genitive singular of the indefinite pronoun quis ("someone"), modifying opera ("labor"), referring to "someone's" (specifically, one of the partners') labor. It is not functioning as a relative pronoun here.
2. §17.2.8.prquaestus... qui — The relative clause qui... descendit defines the subject quaestus of the main clause. The structure is "that which (qui...) derives from someone's labor is understood as gain (quaestus)."