"If we had soil-coagulants enough," said Hardwick vexedly, "we could handle that upside-down swamp the civilians have so carefully made, here. But we haven't got it! But the freshened sea water they've been irrigating with is practically mineral-free! I want to know how much mineral content in the water would keep the swamp-mud from acting like wet soap. It's entirely possible that we'd have to make the soil too salty to grow anything, in order to anchor it. But I want to know!" Barnes said uncomfortably: "Wouldn't you, sir ... wouldn't you have to put the minerals in irrigation-water to get them down to the ... the swamp?" Hardwick grinned, very surprisingly. "You've got promise, Barnes! Yes. I would. And it would increase the rate of slide before it stopped it. Which could be another problem. But it was good work to think of it! When we get back to Headquarters, you commandeer a laboratory and make those measurements for me." "Yes, sir," said Barnes. "We'll start back now," said Hardwick. * * * * * The recreation-boat obediently turned. It went out to sea until the water flowing past its hull was crystal-clear. And Hardwick seemed to relax. On the way they passed more small boats. Many of them were gardeners' boats, from which men dived with diving masks to tend or harvest the cultivated garden-patches not too far down. But many were pleasure boats, from double-hulled sailing craft intended purely for sport, to sturdy though small cabin cruisers which could venture far out to sea, or even around to the windward of the island for sport-fishing. All the pleasure craft were crowded--there were usually some children--and it was noticeable that on each one there were always some faces turned toward the shore. "That," said Hardwick, "makes for emotional thinking. These people know their danger. So they've packed their children and their wives into these little cockleshells to try to save them. They're waiting offshore here to find out if they're doomed regardless. I wouldn't say"--he nodded toward a delicately designed twin-hull sailer with more children than adults aboard--"I wouldn't call that a good substitute for an Ark!" Young Barnes fidgeted. The boat turned again and went parallel to the shore toward where Headquarters land came down to the sea. The ground was firmer, there. There had been no irrigation. Lateral seepage had done some damage at the edge of the reserve, but the major part of the shoreline was unbroken, unchanged solid ground, looming above the beach. There was, of course, no sand at the edge of the water. There had been no weathering of rock to produce it. When this island was upraised, its coating of hardened ooze protected the stone. The small lee-side waves merely lapped upon bare, curdled rock. The wharf for pleasure boats went out on metal pilings into deep water. "Excuse me, sir," said young Barnes embarrassedly, "but ... if the fuel blows, it'll be pretty bad, sir."