"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 the superficial area
165,480,000 square miles.
How vastly different from the flat and puny area of the circumscribed vision of the dweller upon the outer crust!
Ready to search a land area of 124,110,000 square miles for my friends, my incomparable mate, and good old Perry!
She knew that her buoyancy tanks might keep her afloat indefinitely, but she had neither food nor water, and she was being borne toward the least-known area of Barsoom.
The air was filled with dust and flying bits of vegetation and when the storm carried her across an irrigated area of farm land she saw great trees and stone walls and buildings lifted high in air and scattered broadcast over the devastated country; and then she was carried swiftly on to other sights that forced in upon her consciousness a rapidly growing conviction that after all Tara of Helium was a very small and insignificant and helpless person.
The long swell caused by the gentle but steady action of the trade-wind, always blowing in one direction over a wide area, causes breakers, almost equalling in force those during a gale of wind in the temperate regions, and which never cease to rage.
Near the head of the lagoon I was much surprised to find a wide area, considerably more than a mile square, covered with a forest of delicately branching corals, which, though standing upright, were all dead and rotten.
Even in the case of slow-breeding animals, which unite for each birth, we must not overrate the effects of intercrosses in retarding natural selection; for I can bring a considerable catalogue of facts, showing that within the same area, varieties of the same animal can long remain distinct, from haunting different stations, from breeding at slightly different seasons, or from varieties of the same kind preferring to pair together.
In a confined or isolated area, if not very large, the organic and inorganic conditions of life will generally be in a great degree uniform; so that natural selection will tend to modify all the individuals of a varying species throughout the area in the same manner in relation to the same conditions.
Fortunately for the pursued, the light of the moon, while it shed a flood of mild luster upon the little area
around the ruin, was not sufficiently strong to penetrate the deep arches of the forest, where the objects still lay in deceptive shadow.
The isolation of the Kaolians is rendered almost complete by the fact that no waterway connects their land with that of any other nation, nor have they any need of a waterway since the low, swampy land which comprises the entire area
of their domain self-waters their abundant tropical crops.
Nor did he merely probe the area
. Thrusting into it from one side, under the skin and parallel to it, he buried the length of the needle from sight through the insensate infiltration.