not that of Lincoln and York, but that more usual in the
west and south of England at Hereford, Wells, Salisbury, Exeter, and
elsewhere, where the aisles of the chancel are returned at the back of
the east wall, and form a vestibule to a projecting aisleless lady
chapel. This type of plan occurs outside its regular district at
Tickhill, on the borders of Yorkshire and Nottinghamshire. But it is
naturally exceptional, and would be used only where there was plenty of
money and space to spare: it demands for its full effect a considerable
elevation, involving a large clerestory, and a church could seldom, if
ever, be found whose original plan invited expansion on these lines. On
the other hand, the aisling of the chancel throughout was simply the
logical development of the ordinary church plan: if the plans of
cathedrals may have suggested the later developments at churches like
Newark or Hull, the simple aisled rectangle, with its three parallel
divisions, and without any clerestory to distinguish the nave from the
aisles--a plan remarkably characteristic of Cornwall--came into
existence in the ordinary course of things, by an extension of the wings
of the building until they flanked the whole of the nave and chancel.

Sec. 74. The work done at Grantham in the fourteenth and fifteenth
centuries illustrates the purely natural development of the ordinary
aisled church into the aisled rectangle. We have seen, in an earlier
chapter, that, soon after 1300, the church consisted of an aisleless
chancel, which was, however, overlapped at the west end by the north
aisle of the nave; a nave, the north and south aisles of which followed
different systems of spacing; a western tower and spire, engaged within
the aisles; and north and south porches. Several chantries were founded
in the church during the fourteenth century. Not long after the Black
Death of 1349, the south aisle was extended eastward to the whole length
of the chancel. The south wall of the chancel was pierced by an arcade;
and the lady chapel thus formed was raised upon a double crypt. It was
not until more than a century later that the east wall of the north
aisle was taken down, and the "Corpus Christi chancel" built out,
continuing the north aisle without a break, and completely flanking
the north wall of the chancel, through which an arcade was made. Here
the reason of expansion was obviously the growth of chantry chapels; and
the expansion follows the simplest co