You have been also considerably stung and bitten by flies, ants, etc., and are most likely sopping wet with rain, or with the wading of streams, and you are tired and your feet go low along the ground, and it is getting, or has got, dark with that ever-deluding tropical rapidity, and then you for your sins get into a piece of ground which last year was a native's farm, and, placing one foot under the tough vine of a surviving sweet potato, concealed by rank herbage, you plant your other foot on another portion of the same vine.