The streets of Paris were now choked with barricades--not the mere temporary breastworks of the first and second days, which a single charge of heavy dragoons would sweep away, but regular systematic, scientific structures, erected apparently under the direction of military engineers, and calculated upon every principle of art to insure resistance. Some of them were of immense size--that, for example, at the corner of the Rue Richelieu; some had port-holes from which protruded the mouths of ordnance in battery; all were surmounted by a flag, tri-color or red, and all were defended by desperate men. Some other thoroughfares were crossed by many barricades--the Rue St. Martin, for instance, by thirty or forty. The troops assailing these structures were mowed down, throughout the day, in a manner which even their opponents deemed most merciless. Instances of individual bravery on both sides were frequent. In the Rue Mauconseil, a young man exposed himself on the top of the barricade, time after time, firing with fatal aim, and every time a shower of balls from the troops assailing whistled around him. But he stood untouched, and, at length, the officer ordering the troops to fire at him no more, he retired at once behind the breastwork. A boy in the Rue St. Honore mounted the barricade, enveloped in a tri-color flag, and dared the troops to fire on their colors. He descended unharmed. An officer of the Line was summoned to yield his sword. He did so, but first broke it in twain across his knee. The same demand was made to a lieutenant of the Municipal Guard, with a musket at his breast; he was bidden also to shout "Vive la Republique!" but he only cried "Vive le Roi!" as the weapon was wrenched from his grasp! Yet he was spared. Arms were demanded from every householder, and when given, the gift was endorsed on the door in these words: "Here we were given arms." One man received a sword splendidly decorated with gems upon its scabbard and hilt. "I want only the blade!" he said, tearing it away from its ornaments and grasping the naked steel! At ten o'clock M. Odillon Barrot, General Lamoriciere and Horace Vernet, the great marine artist, proceeded on horseback to the barricades to induce the people to disperse, but all their eloquent entreaties were received only with insults. "No truce--no tricks--no mistake this time!" were the decisive shouts with which they were greeted. A second time, in the Rue Richelieu, General Lamoriciere, accompanied by Moline Saint Gru bearing a palm-branch, was equally unsuccessful. "It is too late!" was the terrible response from the heart of the barricades, followed by a shower of stones, one of which wounded General Lamoriciere on the hand. A third time, in the Rue Rohan, General Gourgaud, who even promised the abdication of the King, met with the same utter defeat, and hastily fled from the fury of the monster now thoroughly roused.