The first is in two parts: in the first, he seeks out the genus of sacraments; in the second, the differences, at But some signs are natural... others are conventional.
Circa primum duo facit: primo ponit sacramentum in genere signi; secundo definit signum, ibi: signum vero est res praeter speciem quam ingerit sensibus, aliquid aliud ex se faciens in cognitionem venire.