"I would say," he replied, "that either you are a fool, or took me for one." "But, Ja," I insisted, "if their theory is incorrect how do you account for the fact that I was able to pass through the earth from the outer crust to Pellucidar.If your theory is correct all is a sea of flame beneath us, where in no peoples could exist, and yet I come from a great world that is covered with human beings, and beasts, and birds, and fishes in mighty oceans.