  Although Burbury had thus succeeded in clarifying the logic of the H-theorem, his actual formulation of Condition A was not particularly transparent. By contrast, Bryan's contribution to the debate may be said to possess the opposite qualities. He was the first to clearly point out that the SZA itself is not invariant under time-reversal. Less convincing is his argument that the time-reversed assumption would suppose the molecules possessing some kind of foresight.