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Updated: October 17, 2026
Since Haeckel seemed to have begun the voyage into multiplicity that Pearson had forbidden to Englishmen, he should have been a safe pilot to the point, at least, of a "proper essence of substance" in its attributes of matter and energy: but Ernst Mach seemed to go yet one step further, for he rejected matter altogether, and admitted but two processes in nature change of place and interconversion of forms.