ogen intoxication. For reasons tare still poorly understood, beneat a  nitrogen becomes apooxicant. Under its influence divers o offer topassing fiso try to  also produced est, ed, t “alternated betion, at onemoment begging to be decompressed because  ‘bloody a minutelaugtempting to interfere erity test.” In order to measurete of deterioration in t, a scientist o go into teer to conduct simple matical tests. But after a fees, as errecalled, “tester oxicated as testee, and often forgot to press topco take proper notes.” tion is even noery. It is t t it may be t causes alcooxication, but as noone knoain   all events,  test care, it is easy to get in trouble once you leave the surface world.

    o our earlier observation t Eart tplace to be an organism, even if it is tion of t’ssurface t is dry enougo stand on, a surprisingly large amount is too  or cold or dry orsteep or lofty to be of muco us. Partly, it must be conceded, t. In terms ofadaptability, ty amazingly useless. Like most animals,  muc places, but because  so freely and easily stroke,  circumstances—on foot  er in a  desert—most peopleo rise again, in no more tgenerating  but—because  keeping it. Even in quitemild o keep your body er ties to a large extent by employing cloter, but even so tions of Earto live are modest indeed: just 12 percentof total land area, and only 4 percent of the seas.

    Yet tle of our planet but t  t  of. You o look at our oem—or, come to t, Eart certainperiods in its oo appreciate t m