This Land of Sand and of a wonderful fertilizing river—what can it be? Gentlemen, it is Egypt! These mountains of rock that the Martians have erected, what are they? Gentlemen, they are the great mystery of the land of the Nile, the Pyramids. The gigantic statue of their leader that they at the foot of their artificial mountains have set up—gentlemen, what is that? It is the Sphinx! […] To think that we should have come to the planet Mars to solve one of the standing mysteries of the earth, which had puzzled mankind and defied all their efforts at solution for so many centuries! Here, then, was the explanation of how those gigantic blocks that constitute the great Pyramid of Cheops had been swung to their lofty elevation. It was not the work of puny man, as many an engineer had declared that it could not be, but the work of these giants of Mars.
I've written a full critical introduction to the novel for its inclusion in my Studies in Ancient Astronautics series. It's volume 3 in the series. I've sent it off to the printers, and it should be available for sale next week. I'll post the link on this linked page when it's ready.