162. Obligation to exercise care.

As the worker is entitled to a reward, either by express agreement or by implication, he is obliged not only to perform his work with reasonable care and skill, but also to take ordinary care of the chattel entrusted to him1, and to restore it to the hirer at the expiration of the period for which it was entrusted to him. If, therefore, he detains it beyond the proper period, he is guilty of a breach of duty, the measure of damages for which is prima facie the sum which would have been earned in the ordinary course of