FAILURE TO BACK UP MULLIN'S FINE WORK CAUSES DEFEAT, 4 TO 1 Big George Pitches Great Game, But Bad Slips by Delehanty and Bush, Mixed in With Gibson's Two-Bagger, Put Pirates in Lead After Clarke's Home Run Ties It Up. ADAMS NERVOUS AT FIRST, BUT SOON SETTLES DOWN Seems to Be Little Choice Between the Two Clubs As Far as Playing Strength Goes--Evenly Matched in Hitting, Detroit Better on the Bases, Pittsburg in the Field. PITTSBURG.