text:  Hail happy day and still return to bless with happier face The sons of Romulus lords of Earth not thankless for thy grace! But who art thou strange biform god and what thy power? for Greece With all her gods of thee and thine hath bade her Muses cease; This say; and say why thou alone of all celestial kind Dost forwards still look steadfastly and also gaze behind? Thus with myself I mused and held my tablets to indite When sudden through the room there shone an unaccustom'd light And in the light the double shape of Janus hoar appear'd And 'fore my view with fix'd regard his double face he rear'd