[CALLISTRATUS libro secundo institutionum. ] §1.7.29.prSi pater naturalis loqui quidem non possit, alio tamen modo quam sermone manifestum facere possit uelle se filium suum in adoptionem dare: perinde confirmatur adoptio, ac si iure facta esset.
[CALLISTRATUS, Institutes, book 2.] If a natural father is indeed unable to speak, but is yet able to make manifest in another way than by speech that he wishes to give his son in adoption, the adoption is confirmed just as if it had been done in accordance with the law.