From the fields, as we whirled into and out of layers of air, sharply, as one does in a motor, came now the odor of ripe straw, now a whiff of coffee from a "goulash cannon," steaming away behind its troop like the calliope in the old-fashioned circus, and now and then, from some thicket or across a clover field, the sharp, dismaying smell of rotting flesh.