Several of his most striking contributions to knowledge originated in the discovery of errors or fallacies in the work of his great predecessors in astronomy.
In all other questions of this kind he shows himself far in advance of the economic fallacies of the day.
His intellect was logical in the highest degree; he was clear and precise, an enemy of loose reasoning, and quick to refute prevailing fallacies.
It becomes necessary, therefore, to determine how far Fechner derived his psychophysics from experience, how far from fallacies of inference, from his romantic imagination and from his theosophic metaphysics, which indeed coloured his whole book on psychophysics.
He was the author of The Military Obligation of Citizenship (1915, lectures at Prince ton and elsewhere); Our Military History, Its Facts and Fallacies (1916); and Universal Military Training (1917).