here there was need of towers.

From the twenty-five gates in each side of this great square went
twenty-five streets, in straight lines to the gates, which were directly
over-against them, in the opposite side; so that the whole number of the
streets was fifty, each fifteen miles long, whereof twenty-five went one
way, and twenty-five the other, directly crossing each other at right
angles. And besides these, there were also four half streets, which had
houses only on one side, and the wall on the other; these went round the
four sides of the city next the walls, and were each of them two hundred
feet broad; the rest were about a hundred and fifty. By these streets thus
crossing each other, the whole city was cut out into six hundred and
seventy-six squares, each of which was four furlongs and a half on every
side, that is, two miles and a quarter in circumference. Round these
squares, on every side towards the street, stood the houses (which were
not contiguous, but had void spaces between them,) all built three or four
stories high, and beautified with all manner of ornaments towards the
streets.(982) The space within in the middle of each square, was likewise
all void ground, employed for yards, gardens, and other such uses; so that
Babylon was greater in appearance than reality, near one half of the city
being taken up in gardens and other cultivated lands, as we are told by Q.
Curtius.

II. _The Quays and Bridge._--A branch of the river Euphrates ran quite
cross the city, from the north to the south side;(983) on each side of the
river was a quay, and a high wall built of brick and bitumen, of the same
thickness as the walls that went round the city. In these walls,
over-against every street that led to the river, were gates of brass, and
from them descents by steps to the river, for the conveniency of the
inhabitants, who used to pass over from one side to the other in boats,
having no other way of crossing the river before the building of the
bridge. The brazen gates were always open in the daytime, and shut in the
night.

The bridge was not inferior to any of the other buildings, either in
beauty or magnificence; it was a furlong in length,(984) and thirty feet
in breadth, built with wonderful art, to supply the defect of a foundation
in the bottom of the river, which was all sandy. The arches were made of
huge stones, fastened together with chains of iron and melted lead. Before
they began to build the bridg