[IDEM libro tertio ad edictum. ] §22.2.7.prIn quibusdam contractibus etiam usurae debentur quemadmodum per stipulationem.
[THE SAME, in the third book on the Edict.] In certain contracts, interest is due just as it is through a stipulation.
nam si dedero decem traiecticia, ut salua naue sortem cum certis usuris recipiam, dicendum est posse me sortem cum usuris recipere.
For if I have given ten as a maritime loan, on the condition that, if the ship is safe, I shall receive back the principal with a certain interest, it must be said that I can recover the principal with the interest.