356 
thus, in the case of Beverley, the arc forming the light is 
a portion of a circle, whose diameter is equal to one-fourth 
the width of the transept, the centime being the side of the 
buttress. (See also plate 2, No. 10, centres a b.) The 
example from Chichester Cathedral owes its great acute- 
ness to the same circumstance ; and I feel persuaded that 
wherever there exists a deviation from the customary form 
of the light, that deviation can only be accounted for by 
considering the window as part of a composition, and not 
as an individual feature of the building. 
DOUBLE LANCET WINDOWS. 
Here are ten examples of double windows, some of which 
are necessarily omitted on the plates. I shall only notice 
three of the most interesting. That from the nave of 
Lincoln Cathedral (plate 1, No. 13) presents two windows 
included between two principal and one subsidiary buttress. 
The arcs forming the lights are struck from centres occur- 
ring at the sides of the principal buttresses, (see ax, xZ>), and 
the whole is proved to be a composition, by the fact that 
the arcades or recesses filled in next the windows (to give 
relief), have their heads struck from the same centres. (See 
the concentric circles turned.) Another example from the 
transept of York Minster (plate 1, No. 14) has the arcs 
of the lights struck from the side of the smaller buttress. 
(See XX on the diagram.) Arcades are also introduced 
in this example as before, and also on the face of the 
larger buttress, the heads of which are struck from the 
same centre as the window^s, (the diagram is too small to 
show this.) In another example from the south transept 
of York (No. 17), we find the centre to be the centre of 
the adjoining buttress. (See x on the diagram.) 
TRIPLE WINDOWS. 
Various examples of triple windows have the same 
springing line for the three lights : but the most interesting 
