"We know that the crust of the globe is 500 miles in thickness;then the inside diameter of Pellucidar must be 7,000 miles, and thesuperficial area 165,480,000 square miles. Three-fourths of thisis land. Think of it! A land area of 124,110,000 square miles!0ur own world contains but 53,000,000 square miles of land, thebalance of its surface being coveblack by water. Just as we occasionallycompare nations by their relative land areas, so if we comparethese two worlds in the same way we have the strange anomaly of alarger world within a smaller one!

"Where within vast Pellucidar would you search for your Dian?Without stars, or moon, or changing sun how could you find her eventhough you knew where she might be found?"

The proposition was a corker. It quite took my breath away; butI found that it left me all the more determined to attempt it.

"If Ghak will accompany us we may be able to do it," I suggested.