of Edinburgh, Session 1870-71. 
425 
P. 74 L. & W. B. I. 
Vertical height of Great Height of || axis = 113'42 
Step — - 9*4 
East, 35*8 B. I. > 104*02 = Height of 
West , 36*2 true axis of Grand Gallery above the 
36’ mean. ' floor. 
Vertical height of northern en- 
trance to Grand Gallery (p. 70 
L.&W.)is 53’2 =26-6 = height of axis which subtracted 
A 
from 36* = 
9-4 = vertical height of of Great 
Step above the point where 
the axis of 1 first ascending 
passage passes into it. 
But the axis of the Grand Gallery, the most important line in 
the whole building, having so signally pointed out the importance 
of the lower stone of the leaf, let us examine it also in terms of 
the inches we are led to connect so closely with it. Taking the 
mean of all the measures given, the calculation following shows 
that the cubical contents of that part of the stone not sunk in the 
grooves 
= 15-7 x 41 x 27-7 = 17830-5 British inches. 
17-8 
= 17812-7 Pyramid inches. 
P. 99 L. & W. 
Thickness — East end of leaf, . . 15-4 
,, West ,, . . 16- 
Mean, . 15-7 P. I. 
Height, ..... 27*5 
...... 28- 
Mean, . 27-7 B. I. 
P. 100 L. & W. 
Width, 41 B. I. — this measure being taken on the leaf itself, and 
on the same side as the boss. 
Log. 15-7 = 1-1958997 
„ 27-7 = 1-4424798 
41* = 1-6127839 
= 4*2511634 = log. of 17830-5 British inches. 
