160. Obligation to do the work.

The first obligation of the worker is to perform his undertaking1. If the worker agrees to perform work which will put the hirer's goods in a certain condition, and the hirer relies on the worker's skill and judgment, the worker owes an absolute obligation to put the goods into that condition and the worker's failure to do so constitutes a total failure of consideration2. The worker will be relieved of the duty to perform, however, if the performance is rendered impossible by the hirer's act3 or by circumstances beyond the worker's control, as where the chattel upon which the