PlTTSBURG, 03t. 1. - About 9 o'clock Saturday nigbt a Uynamite bomb was exploded in front oL the postoffiee at Slianuapin, Beaver county, and an bour later another was put off fn tbe rear of the same building, shattering the windows and breaking uearly all the bottles in a drug store ad.iacent. The perpetrator.s of the outrage are not known, but it is supposed that the bombs were intended to biovv up a disroputablo house near by. The postinaster notilied the sheriff oL the county and the authorities at Washington, and ell'orte will be made to lind the guüty parties.