Chief among those against whom the popular feeling was now directed, was Hart & Co., large commission merchants in Washington Street, between Dey and Cortlandt Streets. Their store was packed with flour and wheat, and every day men passed it with sinister looks. Sometimes a little knot of men would stop opposite it, and talk of the loads of grain stored up there, while their own families were pinched for bread. They would gaze savagely on its heavy iron doors, that seemed to defy the weak and helpless, and then walk on, muttering threats and curses. These signs of a gathering storm were, however, unheeded by the proprietors. Others, better informed, were not so tranquil; and by anonymous letters tried to arouse Mr. Hart to take precautionary measures. An anonymous letter addressed to Mr. W. Lenox was picked up in the Park, in which the writer stated that a conspiracy was formed for breaking open and plundering Mr. Hart's store, and gave the following plan of action. On some dark night, two alarms of fire were to be given, one near the Battery, and the other up town, in order to draw off the watchmen and police, when a large crowd already assembled in the neighborhood would make a sudden rush for the building, and sack it before help could arrive. This letter was handed to the High Constable Hays, who showed it to Hart & Co., but they seemed to regard it as an attempt to frighten them. This was followed by anonymous letters from other parties, that reached the Mayor, insisting on it that danger was hanging over this house. He sent them to Hart & Co., but they, thinking it was only a trick to put down the price of flour, paid no attention to them. They locked their three massive iron doors at night as usual, and went to their homes without fear, and the underground swell kept on increasing in volume. The first plan of operation, if it ever existed, was either abandoned by the mob or deferred till after other measures were tried. At length, on the afternoon of the 10th of February, the following placard was posted up all over the city: BREAD, MEAT, RENT, FUEL! _The voice of the people shall be heard and will prevail._ The people will meet in the PARK, _rain or shine_, at four o'clock on MONDAY AFTERNOON, to inquire into the cause of the present unexampled distress, and to devise a suitable remedy. All friends of humanity, determined to resist monopolists and extortioners, are invited to attend. Moses Jacques. Daniel Graham. Paulus Hedle. John Windt. Daniel A. Robertson. Alexander Ming, Jr. Warden Hayward. Elijah F. Crane. NEW YORK, _Feb_. 10_th_, 1837.