Note 109 — Chapter III

Vasari says here that the ‘Rustic’ or Tuscan column is six ‘heads’ high. What does he mean by this? There is evidently in his mind the familiar comparison of different columns to human figures of different proportions, a conceit found in Vitruvius (IV, i, 6 f.) and in writers of the Renaissance (see Alberti, De Re Aedificatoria, Lib. IX, c. 7), and so he measures by ‘heads,’ which would apply to a figure but not to a column. ‘Testa,’ ‘head,’ cannot, as the context shows, mean the height of the capital of the column. It really means here the lower diameter of the column. It is this lower diameter (or sometimes half the lower diameter) that is the normal unit of measurement for the proportions of a column. Thus the height of the Tuscan column is given by Vitruvius and by Palladio and other moderns as six times the lower diameter. Though ‘head’ may seem a very curious word with which to describe this, there is no doubt that such is the meaning of it. Alberti, in his tract on the Orders and their proportions, uses the lower diameter as his measure but applies to it this very term ‘testa.’ There is a certain letter from Vasari to Duke Cosimo that deals with the measurements of a column of granite presented to him by the Pope and afterwards conveyed from Rome and set up in the Piazza di S. Trinità, where it carries the porphyry statue by Francesco del Tadda (postea, p. 111). Vasari gives the diameter of the ‘head’ of this column, but notes afterwards that the shaft diminishes from the ‘head’ upwards towards the necking (collarino). Hence there is no doubt about the interpretation of the word in question. See the letter in Opere, ed. Milanesi, VIII, 352.