"By San Marco, the people are up!" said Giulio, excitedly. "'T is the _campana_; 't is the mad bellow of the old cow of the Vacca! Quick, stand to your arms, Giovanni, for soon all Florence will be at your doors!" Too well the boys knew the meaning of that tolling bell--the great bell of the Palazzo Vecchio, "the old cow of the Vacca," as the Florentines called it. Its loud _boom_--_boom_--meant "Danger for Florence!" And, as its clang sounded over the city from gate to gate, every citizen, no matter what he might be doing, answered the summons by snatching up the arms that were handiest and hastening to the great square of the Vecchio. "Pietro is lost!" shouted the cardinal. "_Palle, palle!_ Medici to the rescue!" But, before the guard could rally to his summons, the door burst open, and in rushed Pietro de Medici, called the Lord of Florence, white-faced and bespattered with mud, while at his heels followed a dozen equally terrified men-at-arms. Without, the yells and hootings of an angry mob filled the air, and the deeper cry of "Liberty, liberty for the people!" sounded above the din. "Well, my brother?" was all the cardinal said. Messer Pietro caught him by the arm. "Quick, send for Orsini and his troops!" he cried excitedly. "Send now, or all is lost, Giovanni. The people are up! The Signory refuses me--me, the Lord of Florence--admittance to the palace. Magistrates whom our father honored and appointed reviled and insulted me; men and women who have lived on our bounty, nay, even the very children hooted and pelted me as I turned from the wicket of the Signory, and now, by the claws of the _marzoccho_! I will have in Orsini's troops and drench the streets with blood." "Hold, hold, Pietro; not so fast, I pray," Giovanni exclaimed. "Is there no loyalty, no respect for the Medici left in Florence? To horse, and follow me! It shall not be said that the sons of Lorenzo the Magnificent lost their lordship without a struggle." Again the palace gates were swung open; again the lily-banner of Florence and the ball-escutcheon of the Medici flashed through the city streets as, followed by Giulio and the Swiss halberdiers, the boy cardinal rode toward the palace of the Signory. "_Palle, palle!_ Medici! ho, Medici!" rang the well-known cry of the great house as the armed guard of the cardinal pressed through the crowded streets. "Hollo, my Lord Cardinal; well met again!" shouted a mocking voice, and around from the great square of the Duomo came Francesco Albizzi and a motley crowd of followers. "Back, Albizzi, back!" Giovanni commanded. "Our business is with the Signory and not with feud-breeders such as art thou." "Ho, hark to the little Illustrissimo! _Popolo! ho, popolo!_" Albizzi shouted, and the surging and excited mass swarmed around Giovanni's little band with the ringing cry: "_Popolo, popolo! Liberta, liberta!_" (The people, the people! Liberty for the people.)