t many years before, and because it was in size and
style a building of considerable merit.

Buono was next invited by the Aretines to their city, where he built
the old residence of the lords of Arezzo, a palace in the Gothic
style, and near it a tower for a bell. This building, which was very
tolerable for that style, was thrown down in 1533 because it was
opposite and too near the fortifications of the city.

The art now began to receive some amount of improvement through the
works of a certain Guglielmo, a German by race, as I believe, and
some buildings were erected at a great expense and in a slightly
better style. In the year 1174 this Guglielmo, in conjunction with
Bonanno, a sculptor, is said to have founded the campanile of the
Duomo at Pisa, where the following words are carved:

_A.D. M..C. 74 campanile hoc fuit fundatum Mense Aug._

But these two architects had not much experience in laying
foundations in Pisa, and since they did not drive in piles as they
should have done, before they were half through the work, there was a
subsidence on one side, and the building leant over on its weaker
side, so that the campanile hangs 6-1/2 braccia out of the straight
according to the subsidence on that side, and although this appears
slight from below, it is very apparent above, so that one is filled
with amazement that the tower can stand thus without falling and
without the walls being cracked. The reason is that the building is
round both within and without, and the stones are so arranged and
bound together, that its fall is all but impossible, and it is
supported moreover by foundations raised 3 braccia above the ground
level, which were made to maintain it after the subsidence had taken
place, as may be seen. Had it been square; I am convinced that it
would not be standing, to-day, as the corners of the square would
have pushed out the sides so that they would have fallen, a thing
which frequently happens. And if the Carisenda tower at Bologna,
which is square, leans without falling, that is because it is
lighter and does not hang over so much, nor is it nearly so heavy a
structure as this campanile, which is praised, not because of its
design or good style, but simply by reason of its extraordinary
position, since to a spectator it does not appear possible that it
can remain standing. The Bonanno mentioned above, while he was
engaged on the campanile, also executed in 1180 the principal door of
the Duomo