It may appear almost incredible to some of my readers that, during the erection of the Exhibition building, and for upwards of five months in which it was resorted to by thousands, and I may add the comparatively short time subsequently occupied in taking down the structure and removing the materials, there was no other infraction of the law brought under magisterial cognizance than the petty larceny case which I have mentioned. I hope that I shall not be considered too discursive if I introduce here an extraordinary and very gratifying statement of an anterior date. The Great Southern and Western Railway of Ireland was opened to Carlow in 1846. The splendid terminus at the King's Bridge and several miles of the line are in the Dublin Metropolitan Police district. The works on that portion included very extensive buildings and deep excavations, and I have been credibly informed that they cost upwards of fifty thousand pounds. A vast number of persons were employed, comprising the various artisans, laborers, (commonly called navvies,) and drivers. I was in office during the entire time of their operations, and there was not even one complaint or charge preferred as arising amongst any class or between individuals. Mr. Dargan, the contractor, at a festive meeting jocularly congratulated me "on having a sinecure, as far as regarded the people at the King's Bridge, where there were no prosecutions required, except the prosecutions of the works." I regret that at the present time such very gratifying qualities could not be expected to a similar extent in similar undertakings. Intemperance has become too prevalent, especially amongst the operative portion of the community, to admit of large numbers being brought together daily, without occasional, or perhaps frequent quarrels. A BELL AND KNOCKER.