  A review of B B-bar mixing results at the end of July 1999 is presented.
Emphasis is put on recent measurements of Delta-Md and Delta-Ms. For Delta-Md,
the new world average is Delta-Md = 0.473 +- 0.016 ps-1. For Delta-Ms, the new
world average 95% CL limit is 12.4 ps-1, with a sensitivity of 14.2 ps-1. Other
related results are covered very briefly.
