To whiche alle othre be degres 2490
Of the metalls ben acordant,
And so thurgh kinde resemblant,
That what man couthe aweie take
The rust, of which thei waxen blake,
And the savour and the hardnesse,
Thei scholden take the liknesse
Of gold or Selver parfitly.
Bot forto worche it sikirly,
Betwen the corps and the spirit,