An intellectual feast! : Isaac Hazlehurst, Esq. will deliver a lecture on Thursday evening next, April 16th, at the room, N.W. cor. Girard Avenue & Thirteenth Sts., (2d story) Subject--The Constitution and the Union Admission, free Yourself and family are invited to be present, as it is intended to be a lecture free from political bias or clap-traps, and designed to impress upon those who may hear it the importance of a better acquaintance with our glorious Constitution and Union, and the fatal consequences resulting from the destruction of either one or the other. At the close of the lecture, Col. Wm. H. Maurice will (by request) recite that beautiful little poem, "The sleeping sentinel!" The lecture will commence at 8 o'clock, and the exercises will close at half-past 9 o'clock. Every family in the Twentieth Ward should be present. / Alexander Whilldin, Esq., will preside.