Originates with the greater complication, multiformity and regularity of natural forces, water, steam, air, electricity.
De Bethune (1559- 1641) — 578 Thiers, Louis Adolphe (1797-1877) — 624 Thomas, Sydney Gilchrist (1850- 1885)— 71 Thun, Alphonse (1853-1885)— 901 Tacqueville, Alexis.