[POMPONIUS libro nono ad Sabinum. ] §18.1.8.prNec emptio nec uenditio sine re quae ueneat potest intellegi.
[POMPONIUS, in the ninth book on Sabinus.] Neither purchase nor sale can be understood to exist without a thing to be sold.
et tamen fructus et partus futuri recte ementur, ut, cum editus esset partus, iam tunc, cum contractum esset negotium, uenditio facta intellegatur: sed si id egerit uenditor, ne nascatur aut fiant, ex empto agi posse.
And yet, future fruits and offspring may be validly purchased, so that, when the offspring is born, the sale is understood to have been made at the very time when the contract was entered into; but if the seller acts to prevent them from being born or produced, an action on the purchase can be brought.
§18.1.8.1Aliquando tamen et sine re uenditio intellegitur, ueluti cum quasi alea emitur.
Sometimes, however, a sale is understood to exist even without a thing, as when what is bought is, so to speak, a chance.
quod fit, cum captum piscium uel auium uel missilium emitur: emptio enim contrahitur etiam si nihil inciderit, quia spei emptio est: et quod missilium nomine eo casu captum est si euictum fuerit, nulla eo nomine ex empto obligatio contrahitur, quia id actum intellegitur.
This happens when the catch of fish, birds, or largesse is purchased; for the purchase is contracted even if nothing is caught, because it is the purchase of a hope; and if what is caught in that case under the name of largesse is evicted, no obligation on the purchase is contracted on that account, because that is understood to have been the agreement.