Ionic order a version of such a perfectly four-sided Ionic capital; Scamozzi's version became so much the standard, that when a Greek Ionic order was eventually reintroduced, in the later 18th century Greek Revival, it conveyed an air of archaic freshness and primitive, perhaps even republican, vitality. The Ionic column is always more slender than the Doric; therefore, it always has a base: Ionic columns are eight and nine column-diameters tall, and even more in the Antebellum colonnades of late American Greek revival plantation houses. Ionic columns are most often fluted. After a little early experimentation, the number of hollow flutes in
Doric order Doric order had not been very widely used, though "Tuscan" types of round capitals were always popular, especially in less formal buildings. It was sometimes used in military contexts, for example the Royal Hospital Chelsea (1682 onwards, by Christopher Wren). The first engraved illustrations of the Greek Doric order dated to the mid-18th century. Its appearance in the new phase of Classicism brought with it new connotations of high-minded primitive simplicity, seriousness of purpose, noble sobriety. In Germany it suggested a contrast with the French, and in the United States republican virtues. In a customs house, Greek Doric suggested incorruptibility;