1337. An administrator may delegate his duties or be represented by a third person for specific acts; however, he may not delegate generally the conduct of the administration or the exercise of a discretionary power, except to his co-administrators.
He is accountable for the person selected by him if, among other things, he was not authorized to make the selection. If he was so authorized, he is accountable only for the care with which he selected the person and gave him instructions.