A special dUpatch to the Chicago Tribune, troin üelviüere, uunois says : The trienio: cases coutinue to créate much exuitement ia this and adjoining couuties. Purk i discarded by every one, and those who havc caten any during the past fortuight are not easy until sufficiunt time elapsos to make it certai they have eseaped the terrible diseaso. It has been ascertaiued that the hog which caused the diseaso was ix yeara oíd, and almost rotten. Ho was fit for uothing but to kül and bury. The progress of the cases is watcbod with deep interest, ns importaut scientific developments are likely to result from a proper study of the disease iu so aggravated i fortu. Preliminary steps toward laying the foundation of the Brooklyu tower of ihe Kast lüver Bridge wcre tnkeu Tuesday, at the upper slip of the Pultoo ferry. - It is intended to have the bed clear for the reception of the caisson by the middle of Marcli.