Hans Kleinpeter, a disciple of Mach with whom Mach in his preface to Erkenntnis und Irrtum explicitly declares his solidarity, says: “It is precisely Mach who is an example of the compatibility of epistemological idealism with the demands of natural science [for the eclectic everything is “compatible"!], and of the fact that the latter can very well start from solipsism without stopping there” (Archiv für systematische Philosophie,[3] Bd. VI, 1900, S. 87). Lucka, analysing Mach’s Analysis of Sensations, says: “Apart from this .