Quickly she went over to their crude table, took up a dish and came back to him.

"Drink this!" bade she.

He took it, wondering.

"What? _Coffee?_ But--"

"Drink! I've had mine, already. Drink!"

Half-stupefied, he obeyed. He drained the whole dish at a draft, then caught his breath in a long sigh.

"But this means water!" cried he, with renewed vigor. "And--?"

"Look here," she directed, pointing. There on the circular hearth stood the copper kettle, three-quarters full.

"Water! You've got _water?_" He started forward in amazement. "While I've been sleeping? Where--?"

She laughed with real enjoyment.

"It's nothing," she disclaimed. "After what you've done for me, this is the merest trifle, Allan. You know that big cavity made by the boiler-explosion? Yes? Well, when we looked down into it, before we ventured out to the spring, I noticed a good deal of water at the bottom, stagnant water, that had run out of the boiler and settled on the hard clay floor and in among the cracked cement. I just merely brought up some, and strained and boiled it, that's all. So you see--"

"But, my Lord!" burst out the man, "d'you mean to say you--you went down _there--alone?_"

Once more the girl laughed.

"Not alone," she answered. "One of the automatics was kind enough to bear me company. Of course the main stairway was impa.s.sable. But I found another way, off through the east end of the building and down some stairs we haven't used at all, yet. They may be useful, by the way, in case of--well--a retreat. Once I'd reached the arcade, the rest was easy. I had that leather rope tied to the kettle handle, you see. So all I had to do was--"

"But the Horde! The Horde?"

"None of them down there, now--that is, alive. None when I was there.

All at the war-council, I imagine. I just happened to strike it right, you see. It wasn't anything. We simply _had_ to have water, so I went and got some, that's all."

"That's all?" echoed Stern, in a trembling voice. "That's--_all!_"

Then, lest she see his face even by the dim light through the window, he turned aside a minute. For the tears in his eyes, he felt, were a weakness which he would not care to reveal.

But presently he faced the girl again.

"Beatrice," said he, "words fall so flat, so hopelessly dead; they're so inadequate, so anticlimactic at a time like this, that I'm just going to skip them all. It's no use thanking you, or a.n.a.lyzing this thing, or saying any of the commonplace, stupid things. Let it pa.s.s.

You've got water, that's enough. You've made good, where I failed.

Well--"

His voice broke again, and he grew silent. But she, peering at him with wonder, laid a hand upon his shoulder.

"Come," said she, "you must eat something, too. I've got a little supper ready. After that, the Pulverite?"

He started as though shot.

"That's so! I _can_ make it now!" cried he, new life and energy suffusing him. "Even with my one hand, if you help me, I can make it!

Supper? No, no! To _work!_"

But she insisted, womanlike; and he at last consented to a bite. When this was over, they began preparations for the manufacture of the terrible explosive, Stern's own secret and invention, which, had not the cataclysm intervened, would have made him ten times over a millionaire. More precious now to him, that knowledge, than all the golden treasures of the dead, forsaken world!

"We've got to risk a light," said he. "If it's turned low, and shaded, maybe they won't learn our whereabouts. But however that may be, we can't work in the dark. It would be too horribly perilous. One false move, one wrong combination, even the addition of one ingredient at the improper moment, and--well--you understand."

She nodded.

"Yes," said she. "And we don't want to quit--just _yet!_"

So they lighted the smaller of their copper lamps, and set to work in earnest.

On the table, cleared of dishes and of food, Stern placed in order eight gla.s.s bottles, containing the eight basic chemicals for his reaction.

Beside him, at his left hand, he set a large metal dish with three quarts of water, still warm. In front of him stood his copper tea-kettle--the strangest retort, surely in which the terrific compound ever had been distilled.

"Now our chairs, and the lamp," said he, "and we're ready to begin.

But first," and, looking earnestly at her, "first, tell me frankly, wouldn't you just a little rather have me carry out this experiment alone? You could wait elsewhere, you know. With these uncertain materials and all the crude conditions we've got to work under, there's no telling what--might happen.

"I've never yet found a man who would willingly stand by and see me build Pulverite, much less a woman. It's frightful, this stuff is!

Don't be ashamed to tell me; are you afraid?"

For a long moment the girl looked at him.

"Afraid--with _you?_" said she.

CHAPTER XXVIII

THE PULVERITE

An hour pa.s.sed. And now, under the circle of light cast by the hooded lamp upon the table, there in that bare, wrecked office-home of theirs, the Pulverite was coming to its birth.

Already at the bottom of the metal dish lay a thin yellow cloud, something that looked like London fog on a December morning. There, covered with the water, it gently swirled and curdled, with strange metallic glints and oily sheens, as Beatrice with a gold spoon stirred it at the engineer's command.

From moment to moment he dropped in a minute quant.i.ty of glycerin, out of a gla.s.s test-tube, graduated to the hundredth of an ounce. Keenly, under the lamp-shine, he watched the final reaction; his face, very pale and set, reflected a little of the mental stress that bound him.

Along the table-edge before him, limp in its sling, his wounded arm lay useless. Yet with his left hand he controlled the sleeping giant in the dish. And as he dropped the glycerin, he counted.

"Ten, eleven, twelve--fifteen, sixteen--twenty! Now! Now pour the water off, quick! _Quick!_"

Splendidly the girl obeyed. The water ran, foaming strangely, out into a gla.s.s jar set to receive it. Her hands trembled not, nor did she hesitate. Only, a line formed between her brows; and her breath, half-held, came quickly through her lips.

"_Stop!_"

His voice rang like a shot.

"Now, decant it through this funnel, into the vials!"