"A brilliant book. . . . No historian of nineteenth- and early twentieth-century German science and philosophy can afford to ignore it." —British Journal for the History of Science
“A clear, comprehensive, and rigorous treatment of the philosophical basis for Fechner’s thought, including, importantly, the way in which he was able to reconcile apparently divergent intellectual themes in his philosophical and scientific writing.” —Isis
“Almost mandatory reading as it provides many new historical insights that are quite significant for contemporary philosophy of science.” —Vienna Circle Institute Yearbook