Erectheus is 21.7.5, being less than the proportionate 
height of the Vitruvian column by nearly a sixth part of 
the diameter. The columns being more than twenty feet 
in height, the upper diameter must be to the lower in the 
ratio of 6 to 7: hence the upper diameter will be 1.11.82, 
which differs but little from that of the Athenian column. 
The extent of the abacus of lonic columns whose height 
is less than 25 feet, ought to be equal to one diameter and 
an eighteenth part. In this instance, therefore, the extent 
would be 2.5.32: in the Athenian columns the extent is 
2.5.4. The volutes of these latter are so very dissimilar to 
those of any of the columns found in Asia Minor, that we 
are not to be surprized if we find but little analogy between 
them and the volutes, as they are generally described by 
Vitruvius. Their projection however, before the line of the 
column, exceeds that of the others by 1.64 inches only; 
although their depth is greater by somewhat more than 
four inches. 
From the state in which the Athenian temple remains, 
we are enabled to ascertain, with the greatest precision, the 
proportion which the epistylium, zophorus, and coronae 
severally bore to the height of the columns. The portico 
indeed has no member of the coronae corresponding to the 
denticulus of Vitruvius; but in that of Minerva Pandrosus, 
which is attached to the same temple, we find it introduced, 
and can readily ascertain the proportion it bore to the 
epistylium. In the entablature of the column which is 
here represented with the proportions of the Athenian, the