"I should say to Emile, "This is a matter of self-defence, for the aggressor does not let you know whether he means to hurt or frighten you, and as the advantage is on his side you cannot even take refuge in flight. Therefore seize boldly anything, whether man or beast, which takes you unawares in the dark. Grasp it, squeeze it with all your might; if it struggles, strike, and do not spare your blows; and whatever he may say or do, do not let him go till you know just who he is. The event will probably prove that you had little to be afraid of, but this way of treating practical jokers would naturally prevent their trying it again. Why should my pupil be always compelled to wear the skin of an ox under his foot? What harm would come of it if his own skin could serve him at need as a sole. It is clear that a delicate skin could never be of any use in this way, and may often do harm. The Genevese, aroused at midnight by their enemies in the depth of winter, seized their guns rather than their shoes. Who can tell whether the town would have escaped capture if its citizens had not been able to go barefoot? Let a man be always fore-armed against the unforeseen. Let Emile run about barefoot all the year round, upstairs, downstairs, and in the garden. Far from scolding him, I shall follow his example; only I shall be careful to remove any broken glass."