And such [adders] lie in await for them that sleep: and if they find the mouth open of them or of other beasts, then they creep in: for they love heat and humour that they find here. But against such adders a little beast fighteth that hight Saura, as it were a little ewt, and some men mean that it is a lizard; for when this beast is aware that this serpent is present, then he leapeth upon his face that sleepeth, and scratcheth with his feet to wake him, and to warn him of the serpent. And when this little beast waxeth old, his eyen wax blind, and then he goeth into an hole of a wall against the east, and openeth his eyen afterward when the sun is risen, and then his eyen heat and take light. This slaying adder and venomous hath wit to love and affection, and loveth his mate as it were by love of wedlock, and liveth not well without company. Therefore if the one is slain, the other pursueth him that slew that other with so busy wreak and vengeance, that passeth weening. And knoweth the slayer, and reseth on him, be he in never so great company of men and of people, and busieth to slay him, and passeth all difficulties and spaces of ways, and with wreak of the said death of his mate. And is not let, ne put off, but it be by swift flight, or by waters or rivers. Marcianus saith that the asp grieveth not men of Africa or Moors; for they take their children that they have suspect, and put them to these adders: and if the children be of their kind, this adder grieveth them not, and if they be of other kind, anon they die by venom of the adder. An oxherd hight Bubulcus, and is ordained by office to keep oxen: He feedeth and nourisheth oxen, and bringeth them to leas and home again: and bindeth their feet with a langhaldes and spanells and nigheth and cloggeth them while they be in pasture and leas, and yoketh and maketh them draw at the plough: and pricketh the slow with a goad, and maketh them draw even. And pleaseth them with whistling and with song, to make them bear the yoke with the better will for liking of melody of the voice. And this herd driveth and ruleth them to draw even, and teacheth them to make even furrows: and compelleth them not only to ear, but also to tread and to thresh. And they lead them about upon corn to break the straw in threshing and treading the flour. And when the travail is done, then they unyoke them and bring them to the stall: and tie them to the stall, and feed them thereat.