720. How stoppage in transit is effected.

An unpaid seller1 may2 exercise his right of stoppage in transit either by taking possession of the goods or by giving notice of his claim to the carrier or other bailee in whose possession the goods are3. This notice may be given either to the person in actual possession of the goods or to his principal, but in the latter case, to be effectual, the notice must be given at such time and under such circumstances that the principal, by the exercise of reasonable diligence, may communicate it to his employee or agent in time to prevent delivery to