(concurring).
I join in that part of the opinion holding that appellant was denied a fair trial when evidence he offered was excluded. Chambers v. Mississippi, 410 U.S. 284, 93 S.Ct. 1038, 35 L.Ed.2d 297 (1973); Commonwealth v. Bailey, 450 Pa. 201, 299 A.2d 298 (1973); Commonwealth v. Collins, 447 Pa. 300, 290 A.2d 121 (1972). Since the Court’s resolution of this issue requires the grant of a new trial, there is no need to reach the other issues discussed in the majority opinion.