As regards animals granted in loan, the Law enacted that if, through the neglect of the person to whom they were lent, they perished or deteriorated in his absence, he was bound to make restitution. But if they perished or deteriorated while he was present and taking proper care of them, he was not bound to make restitution, especially if they were hired for a consideration: because they might have died or deteriorated in the same way if they had remained in possession of the lender, so that if the animal had been saved through being lent, the lender would have gained something by the loan which would no longer have been gratuitous. And especially was this to be observed when animals were hired for a consideration: because then the owner received a certain price for the use of the animals; wherefore he had no right to any profit, by receiving indemnity for the animal, unless the person who had charge of it were negligent. In the case, however, of animals not hired for a consideration, equity demanded that he should receive something by way of restitution at least to the value of the hire of the animal that had perished or deteriorated.
Reply Obj. 5: The difference between a loan and a deposit is that a loan is in respect of goods transferred for the use of the person to whom they are transferred, whereas a deposit is for the benefit of the depositor. Hence in certain cases there was a stricter obligation of returning a loan than of restoring goods held in deposit. Because the latter might be lost in two ways. First, unavoidably: i.e. either through a natural cause, for instance if an animal held in deposit were to die or depreciate in value; or through an extrinsic cause, for instance, if it were taken by an enemy, or devoured by a beast (in which case, however, a man was bound to restore to the owner what was left of the animal thus slain): whereas in the other cases mentioned above, he was