'FHtMlbmH,At Pittsburg, It Was Believed, Will Be of More Than Usual Importance.OLD COMRADES TO GREET HIM.Man Who Drove For Three Previous Presidents, to Drive Carriage, Conveying President, Tomorrow, to thePark—Probable Program.Pittsburg, July 3.—The belief that the address of President Roosevelthere on the Fourth of July will be of more than passing importance was increased yesterday, when word was received from his secretary, George B. Cortelyou, that the address which had been prepared would be changed. Acting on this information an expert stenographer has been engaged to take the address verbatim.When President Roosevelt arrives tomorrow those who will assist in welcoming him will be four men who served under him when he was colonel of the Rough Riders, namely, George B. Cooper. Charles E. McKinley, Edward Lane and Edward Kearns, the latter now being a lieutenant in the Eighteenth regiment. These men were behind President Roosevelt when he led his famous charge up San Juan hill, Cooper and Kearns being Pittsburgers, Lane an Oregon boy, while McKinley comes from Ohio.New Carriag* to Be Used.In a fine carriage he will be ear-red from Union station to Schenley park. It is a heavily upholstered landau, which has never been used.Attached to it will be four coal-blackhorses, wearing gold mounted harness, and each shod with rubber shoes. In charge of these magnificentsteeds will be John Brooks, who has the distinction of having driven three jievious presidents, Cleveland, Harmon and McKinley.Arrangements to protect the presi dent on his arrival have been completed by secret service men and city officials. At the station unusual precautions will be taken. There will be a solid phalanx of the Sheridan troop and other military organizations, besides a double row of ropes and posts.Superintendent of Detectives Philip LKmmel will be in charge of the detectives at the station.Exoerted at R:4S A. M.