The strain of the next three years' continuous work undermined his health and his eyesight, and he was compelled to retire from his professorship. During these years he had published works on Plato and Socrates and a history of philosophy (1875); but after his retirement he further developed his philosophical position, a speculative eclecticism through which he endeavoured to reconcile metaphysical idealism with the naturalistic and mechanical standpoint of science.
Frostburg is in the midst of the coal region of the state, and is itself almost completely undermined; it has planing mills and manufactures large quantities of fire-brick.
Until the beginning of the 17th century the Byzantine tradition that in all matters outside the sphere of dogma the ecclesiastical is subordinate to the civil power had been observed in Russia; but the traditional conceptions had been to some extent undermined during the reign of Michael, when the metropolitan Philaret, who was the tsar's father (vide supra), became patriarch and was associated with his son in the government on a footing of equality.
It is frequently supposed that the influence of the " old Political Economy " has been gradually undermined by the attacks of the historical school.
This event seemed to place Napoleon's fortunes on a sure basis; but already they were being undermined by events.