Mutuum

Mutuum, a loan whereby the absolute property in the thing lent passes to the borrower, it being for consumption, and he being bound to restore, not the same thing, but other things of the same kind. Thus, if corn, wine, money, or any other thing which is not intended to be returned, but only an equivalent in kind, is lost or destroyed by accident, it is the loss of the borrower; for it is his property, and he must restore the equivalent in kind; the maxim ejus est periculum cujus est dominium applying to such cases.

In a mutuum the property passes immediately from the mutuant or lender to the mutuary or borrower, and the identical thing lent cannot be recovered or redemanded, Jones on Bailm. 64