  The kick-off was an letter by Culverwell (1894) with the innocently-sounding question, “Will anyone say exactly what the H-theorem proves?” The question triggered several responses. Culverwell noted, with some amusement, in a subsequent letter (1895)  that they all seemed to argue quite differently. Perhaps the most important responses were Burbury (1894a) and (1894b) and Bryan (1894). Burbury argued that the H-theorem rests on an additional assumption, which was independent of mechanical theory, which he coined “Condition A”. His actual phrasing of the condition was somewhat involved. In any case, Burbury, argued out that the reversed motion would not satisfy Condition A, and that the H-theorem would thus fail to be applicable. He thus succeeded in finally illuminating the logical situation between the reversibility objection and the H-theorem. The theorem assumed the validity of a condition, which would be violated in the reversed motion; i.e., Condition A itself already contained a time-asymmetrical element. Further, given the time-reversal invariance of the mechanical laws governing the system, any motivation for the condition would have to come from beyond these laws and must thus be non-mechanical.