Onetime National League Hurling Ace Now Member of House of David Traveling Ball Outfit.By GEORGE KIRKSKY (Vnited Presa Staff Correspondent.)CHICAGO, Aug. 22. -(tin-He was batting grounders in infield practice when I walked into a ball park in the heart of Chicago's black beltwhere the House of David team wasGROVER ALEXANDERto play Cole's American Giants, anegro nine.Even if every other ball player on the field lmdnt been black or wore General Grant whiskers, anyone who had seen him from the time he broke in with the Phillies in 1911 until he pitched his last game In the National