St. Louis, Aug, 1 7. - Tho Kansas Paoilic Ilrailroad will be opened for ausiness September first. The completion of thia ne-v route to the Paoific will se celebrated by an excursión to Den ver, leaving hero Tuesday, August 3üttii. The party will nuniber about ene hundred, and will be ooinposed chiefiy of officers of conneotirig railroads, proprie;ors or chief editora of some of the ieadog journak of the country and menibers of the Congressioual Committea on Pacific Railroads. The train will consist of Pullroau's finest ears, threo commissury cars, and everythiug will bo done to inaure the comfort and convenence of the guests. The trip will oecupy from ten to twelve days, and will embrace a buffalo hunt at or near Fort Hays, Kansas, a visit to Cheyene and threo days sojouru in tho niountains weat of Denver.