Address of A. R. Wallace at the Glasgow Meeting. 388 
capable of more accurate determination owing to the discovery 
of some of the original casing-stones and the clearing away of 
the earth from the corners of the foundation, showing the 
order to fix the dimensions and angles of all accessible parts of 
the structure ; and he has carefully determined these by a com- 
parison of his own and all previous measures, the best of which 
agree pretty closely with each other. The results arrived at 
are— 
1. That the pyramid is truly square, the sides being equal 
and the angles right angles. 
2, That the four sockets on which the four first stones of the 
corners rested are truly on the same 1. 
That the direction of the sides are accurately to the four 
cardinal points. 
4. That the vertical height of the pyramid bears the same 
Proportion to its circumference at the base, as the radius of a 
circle does to its circumference. 
ow all these measures, angles, and levels are accurate, not 
a8 an ordinary surveyor or builder could make them, but to 
such a degree as requires the very best modern instruments and 
all the refinements of geodetical science to discover any error 
at all. In addition to this we have the wonderful perfection of 
with the utmost accuracy, while every part of the building 
exhibits the highest structural science. 
remarkable, and worthy of the deepest consideration. They 
are facts which. in the pregnant words of the late Sir John 
Herschel, “according to received theories ought not to happen,’ 
and Which, he tells us, should therefore be kept ever present to 
eur minds, since “they belong to the class of facts which serve 
‘Peceding lower state; and it is inferred that this progress is 
Visible to us throughout all history and in all the material 
ords of human intellect. But here we havea building which 
hg far inferior, is very much superior to all which followed 
‘ Great men are the products of their age and country, and 
~ Geésigner 
