  It appears, therefore, that Boltzmann is the father of many approaches, even if these approaches are presently seen as conflicting with each other. This is due to the fact that during his forty years of work on the subject, Boltzmann pursued many lines of thought. Typically, he would follow a particular train of thought that he regarded promising and fruitful, only to discard it in the next paper for another one, and then pick it up again years later. This meandering approach is of course not unusual among theoretical physicists but it makes it hard to pin down Boltzmann on a particular set of rock-bottom assumptions, that would reveal his true colors in the modern debate on the foundations of statistical physics. The Ehrenfests (1912) in their famous Encyclopedia article, set themselves the task of constructing a more or less coherent framework out of Boltzmann's legacy. But their presentation of Boltzmann was, as is rather well known, not historically adequate.