What is that sound high in the air Murmur of maternal lamentation Who are those hooded hordes swarming Over endless plains, stumbling in cracked earth
Throughout the piece Eliot seems to frame the modern world and its denizens against the natural world. It is possible that the "hooded hordes" described in this segment depict the brutal force of the transition into modernity, thundering through nature in the name of progress and at the expense of the natural world. The impact of those hordes on nature is apparent in the other lines that allude to nature's decline - rivers sweating oil and tar, the brown fog, the hole in the mountain. At the same time, the image of those hordes - cloaked, faceless, swarming - suggests that the very process of relentless advancement in itself can be destructive, contributing to adversity and degradation of the swarming hordes in addition to their environment.