24 
to be equally inclined, it follows, that the profile of the 
pyramid, cut perpendicularly from the summit to the 
base through the middle of two of its opposite sides, 
ought to present an equilateral triangle. This happy 
idea, caused by the most simple rectilinear figure em- 
ployed in the construction of an edifice, produces the 
finest phenomenon. This was the stimulus which im- 
pelled me to try to verify it. 
When the pyramids are observed at some distance, 
the base appears much longer than the sides, or the 
angle of the summit more open or obtuse than the 
angles of the base. But the origin of this illusion is> 
that the eye generally takes in two sides at one view, 
when the diagonal of the square of the base is seen., 
which is of course longer than its side. This also 
causes the pyramids to have a flattened appearance, 
though in reality the height of one of the sides is equal 
to a side of the base. 
The problem respecting the use to which these 
pyramids were destined is also solved. They were in- 
tended to serve as a last abode for the bodies of sove 
reigns, who, carrying beyond the grave the enormous 
distinction of their rank over a slavish people, were 
desirous of having their mortal remains raised towards 
the heavens, while those of their subjects were buried 
in the abyss of the wells of mummies, which are in the 
neighbourhood. Such is man! and especially powerful 
man! 
The pyramids are known by the Arabs under the 
name of El Haram Firaoun, who relate a thousand 
stories concerning them, and believe that their sub- 
terraneous galleries branch out and extend themselves 
through all Lower Egypt. 
It is certain that no inscription or hieroglyphic exists 
