CAIRO TO KISUMU contains nearly ninety million cubic feet of limestone. This is so much that if it could be split into flags four inches thick, it would furnish enough to make a pavement two feet wide reaching over sea and land clear around the globe.

When Cheops completed this great structure he faced the exterior with limestone and granite slabs. The sides were as smooth as glass and met in a point at the top. The length of each side was eighteen feet greater than it is now. Indeed, as the bright sun played upon its polished surface the Pyramid must have formed a magnificent sight.

As it is to-day, when one views it from afar, the Great Pyramid still looks like one smooth block of stone. It is only when he comes closer that he sees it is made of many blocks. The Pyramid is built of yellow limestone and conglomerate. The stones are piled one on the other in regular layers. There is no cement between them, but they are chinked with a rough mortar which has with¬ stood the weather for all these ages. 1 dug at some of this mortar with my knife, but could not loosen it, and went from block to block along the great structure on the side facing the western desert, finding the mortar everywhere solid.

And this huge pile was built over forty centuries ago. It seems a long time, but when you figure out how many lives it means it is not so old after all. Every one of us knows one hundred men who have reached forty years. Their aggregate lives, if patched together, would go back to the beginning of this monument. In other words, if a man at forty should have a child and that child should live to be forty and then have a child, and the programme 92