859 
secting principle, and are, as before mentioned, multiple 
windows : thus disproving Rickman's assertion, that " they 
are separate windows, having their heads formed from 
" individual centres." — ( Attempt^ p. 58, Fourth Edition,) 
No description can be given of the singular examples trom 
the gables of Salisbury Cathedral, (Nos. 4 and 5, plate 2). 
I shall, therefore, only remark, that they present the same 
evidences of design, and attention to geometric principles. 
No. 15, plate 1, presents one method of forming the 
" vesica piscis," (fully explained in a former paper,) the 
name of a window having a symbolical representation of 
Christ, under the figure of a fish. This form was held in 
peculiar reverence by the early Christians, and occurs in 
the old Church of Romsey, Hampshire ; St. Leonard's, 
Stamford ; and in Salisbury and Beverley Minsters ; and 
I have recently met with a curious example, (with perpen- 
dicular tracery) in Kirkstall Abbey ; it is in the south 
transept, but at such a height as to be inaccessible. The 
vesica piscis also occurs in the upper part of the Norman 
front of the Cathedral at Angouleme, in France. 
The last example of windows (plate 1, No. 16) is the 
very curious one in the gable of the south transept of 
York Minster. I have now shown, for the Jirst time, the 
normal lines by which the form is obtained. A simple 
equilateral triangle, subdivided on each of its sides into 
three parts, gives the base of so many separate triangles, 
from which spherical equilateral triangles are readily ob- 
tained. The notched appearance in the outline is produced 
by the central trianorle on each side being again subdivided 
into two smaller spherical triangles. In the diagram merely 
the outline is referred to, but it is not difficult to imagine 
the beauty of a decorated window of this form, with its 
tracery filled in to the six primary spherical triangles. 
