All tangible, all concrete, all susceptible of being weighed, measured, put in figures, fenced and bounded, legislated about and so on and so forth.

But _air_--!" He snapped his manicured fingers, to show his well-considered contempt for the Billionaire's scheme, and, throwing away his smoked-out cigar, chose a fresh one.
Flint made no reply, but with an angry grunt flung a look of scorn at the calm and placid one.

Then, furtively opening his desk drawer, he once more sought the little vial and took two more pellets--an action which Waldron, without moving his head, complacently observed in a heavily-bevelled mirror that hung between the windows.
"Air," murmured Waldron, suavely.

"Hot air, Flint ?" No answer, save another grunt and the slamming of the desk-drawer.
And thus, in silence, the two men, masters of the world, awaited the coming of the practical scientist, the proletarian, on whom they both, at last analysis, had to rely for most of their results..