Guilty indeed are the magistrates of New York City for the many lives which have been lost by the falling of buildings because <if insufficient workmanship. Every few weeks, a building in the course of construction tum bles down, and some poor fellow is killed, leaving perhaps a widow and small family, wrecked on the cold world's bleak shore.— On Tuesday last week (7th inst.,) a large five story brick building, !i0 feet front and 40 feet deep, together with two large houses on Thir ty-second street, this city, in course of erec tion and near completion, fell with a terrible crash, and instantly killed three of the persons who were at work, and severely injured a number of others. The cause was insufficient strength of supports. When shall we be able to cease chronicling such calamities.