  Static and dynamic transport measurements on stacks of intrinsic Josephson
junctions on Bi2Sr2CaCu2O8+delta single crystals, near to optimal doping, are
presented. The zero bias minimum in dynamic conductance is consistent with a
normal state pseudo-gap. At Tc, a critical current develops simultaneously with
new features consistent with a gap in the superconducting density states at an
already well-established energy. The lack of thermal broadening and the small
scale of the features force us to conclude a high degree of coherent interlayer
tunneling in both the superconducting and normal states.
