122. And from Volterra, the Florentine army entered on the territory of Pisa; and now with so high prestige, that the Pisans at once sent ambassadors to them with keys in their hands, in token of submission. And the Florentines made peace with them, on condition that the Pisans should let the Florentine merchandize pass in and out without tax;--should use the same weights as Florence,--the same cloth measure,--and the same alloy of money. 123. You see that Mr. Adam Smith was not altogether the originator of the idea of free trade; and six hundred years have passed without bringing Europe generally to the degree of mercantile intelligence, as to weights and currency, which Florence had in her year of victories. The Pisans broke this peace two years afterwards, to help the Emperor Manfred; whereupon the Florentines attacked them instantly again; defeated them on the Serchio, near Lucca; entered the Pisan territory by the Val di Serchio; and there, cutting down a great pine tree, struck their florins on the stump of it, putting, for memory, under the feet of the St. John, a trefoil "in guise of a little tree." And note here the difference between artistic and mechanical coinage. The Florentines, using pure gold, and thin, can strike their coin anywhere, with only a wooden anvil, and their engraver is ready on the instant to make such change in the stamp as may record any new triumph. Consider the vigour, popularity, pleasantness of an art of coinage thus ductile to events, and easy in manipulution. 124. It is to be observed also that a thin gold coinage like that of the English angel, and these Italian zecchins, is both more convenient and prettier than the massive gold of the Greeks, often so small that it drops through the fingers, and, if of any size, inconveniently large in value. 125. It was in the following year, 1255, that the Florentines made the noblest use of their newly struck florins, so far as I know, ever recorded in any history; and a Florentine citizen made as noble refusal of them. You will find the two stories in Giovanni Villani, Book 6th, chapters 61, 62. One or two important facts are added by Sismondi, but without references. I take his statement as on the whole trustworthy, using Villani's authority wherever it reaches; one or two points I have farther to explain to you myself as I go on.