The Continental Shelf slid beneath me, dropping away as my course took me further from the Highland borders. The Lowlands lay patched with inky shadows and splashes of moonlight. Domes with upstanding, rounded heads; plateaus of naked black rock, ten thousand feet below the zero-height; trenches, like valleys, ridged and pitted, naked in places like a pockmarked lunar landscape. Or again, a pall of black mist would shroud it all, dark curtain of sluggish cloud with moonlight tinging its edges pallid green. To my left, eastward toward the great basin of the mid-Atlantic Lowlands, there was always a steady downward slope. To the right, it came up over the continental shelf to the Highlands of the United States. There was often water to be seen in these Lowlands. A spring-fed lake far down in a caldron pit, spilling into a trench; low-lying, land-locked little seas; canyons, some of them dry, others filled with tumultuous flowing water. Or great gashes with water sluggishly flowing, or standing with a heavy slime, and a pall of uprising vapor in the heat of the night. At 37 deg.N. and 70 deg.W., I passed over the newly named Atlas Sea. A lake of water here, more than a hundred miles in extent. Its surface lay fifteen thousand feet below the zero-height; its depth in places was a full three thousand. It was clear of mist to-night. The moonlight shimmered on its rippled surface, like pictures my father had often shown me of the former oceans. I passed, a little later, well to the westward of the verdured mountain top of the Bermudas. There was nothing of this flight novel to me. I had frequently flown over the Lowlands; I had descended into them many times. But never upon such a mission as was taking me there now. I was headed for Nareda, capital village of the tiny Lowland Republic of Nareda, which only five years ago came into national being as a protectorate of the United States. Its territory lies just north of the mountain Highlands of Haiti, Santo Domingo and Porto Rico. A few hundred miles of tumbled Lowlands, embracing the turgid Nares Sea, whose bottom is the lowest point of all the Western Hemisphere--some thirty thousand feet below the zero-height. The village of Nareda is far down indeed. I had never been there. My charts showed it on the southern border of the Nares Sea, at minus twenty thousand feet, with the Mona Valley behind it like a gash in the steep upward slopes to the Highlands of Porto Rico and Haiti. Nareda has a mixed population of typical Lowland adventures, among which the hardy Dutch predominate; and Holland and the United States have combined their influence in the World Court to give it national identity. * * * * *