Vitruvius Pollio, The Ten Books on Architecture
Morris Hicky Morgan, Ed.

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2. Next let the width be divided into ten parts. Of these, let three on the right and three on the left be given to the smaller cellae, or to the alae if there are to be alae, and the other four devoted to the middle of the temple. Let the space in front of the cellae, in the pronaos, be marked out for columns thus: the corner columns should be placed opposite the antae on the line of the outside walls; the two middle columns, set out on the line of the walls which are between the antae and the middle of the temple; and through the middle, between the antae and the front columns, a second row, arranged on the same lines. Let the thickness of the columns at the bottom be one seventh of their height,

their height one third of the width of the temple, and the diminution of a column at the top, one fourth of its thickness at the bottom.