er," Flint waived him, promptly. "I don't care for formulas or
details. What I want is results and general principles. Any other way to
extract these substances, in commercial quantities, from the air we
breathe?"

"Two others. But one of these operates at a prohibitive cost. The
other--"

"Yes, yes. What is it?" Flint slid off the edge of the table and walked
over to Herzog; stood there in front of him, and bored down at him with
eager eyes, the pupils contracted by morphine, but very bright. "What's
the best way?"

"With the electric arc, sir," answered the chemist, mopping his brow.
This grilling method reminded him of what he had heard of "Third Degree"
torments. "That's the best method, sir."

"Now in use, anywhere?"

"In Notodden, Norway. They have firebrick furnaces, you understand, sir,
with an alternating current of 5000 volts between water-cooled copper
electrodes. The resulting arc is spread by powerful electro-magnets,
so." And he illustrated with his eight acid-stained fingers. "Spread
out like a disk or sphere of flame, of electric fire, you see."

"Yes, and what then?" demanded Flint, while his partner, forgetting now
to smile, sat there by the window scrutinizing him. One saw, now, the
terribly keen and prehensile intellect at work under the mask of assumed
foppishness and jesting indifference--the quality, for the most part
masked, which had earned Waldron the nickname of "Tiger" in Wall Street.

"What then?" repeated Flint, once more levelling that potent forefinger
at the sweating Herzog.

"Well, sir, that gives a large reactive surface, through which the air
is driven by powerful rotary fans. At the high temperature of the
electric arc in air, the molecules of nitrogen and oxygen dissociate
into their atoms. The air comes out of the arc, charged with about one
per cent. of nitric oxide, and after that--"

"Jump the details, idiot! Can't you move faster than a paralytic snail?
What's the final result?"

"The result is, sir," answered Herzog, meek and cowed under this
harrying, "that calcium nitrate is produced, a very excellent
fertilizer. It's a form of nitrogen, you see, directly obtained from
air."

"At what cost?"

"One ton of fixed nitrogen in that form costs about $150 or $160."

"Indeed?" commented Flint. "The same amount, combined in Chile
saltpeter, comes to--?"

"A little over $300, sir."

"Hear that, Wally?" exclaimed the Billionaire, turning to his now
interested assoc