of the amount of building that went
on between 1200 and 1300. But it was not till 1288-1305 that Bishop
Gilbert de S. Leophardo had added the two new bays of the lady-chapel
eastward.

The fire was the direct cause of most of the work that was done. There
was another, however; for eleven years after the re-dedication, two
of the towers fell. It has been supposed by some that these must have
been the early towers of the west front, both of which still preserve
indications of having been begun during the twelfth century as part of
the original building scheme. It is probable, for reasons that will
appear later, that the two towers of the west front did not collapse
at the time of the second fire, although it would seem from the
Chronicle of Dunstable that their stability may have been impaired in
some measure, since the sole cause for this fall of towers is given in
the words "impetu venti ceciderunt duae turres Cicestriae." [5] But if
these towers had been affected, what of the original central tower?
Its risk of receiving serious damage would be far greater. That no
more than the upper story of one of these can have fallen is evident
from the fact that the south-western tower presents for examination to
this day its original base, and the nature of the upper part of this
same tower shows that it was rebuilt anew daring the first half of the
thirteenth century. It was necessary that the two towers at the west
as well as the central tower should be finished up to a certain level,
for, placed as they were upon the plan, they became essential parts of
the structure, whose absence would diminish the strength of the whole;
hence any desire to maintain the fabric satisfactorily would require
that those of them which fell should receive the immediate attention
of the builders. In the case of the south-west tower we have already
seen what was done, and obviously it was one of the two towers that
had fallen. But what of the other of these? What suggestions remain to
show which it was? It is well known that a central tower had been
erected as part of the original plan, and also that a new upper part
was being added to this same tower about the middle of the thirteenth
century. This new portion eventually rose above the roofs to the level
of the top of the square parapet, about the base of the octagonal
spire, the spire being a still later addition. Now the heightening of
this tower--perhaps with already the idea of a future spire