"I am."

"These, obviously, are your photographs?"

McKay smiled: "Obviously."

"Certainly. And all these other documents appear to be in order"—he laid them carelessly on his desk—"IF," he added, "Delle is your ultimate destination and terminal."

"We go farther," said McKay in a low voice.

"Not unless you have something further to offer me in the way of credentials," said the ruddy, white-haired Mr. Recklow, smiling his terrifying smile.

"I might mention a number," began McKay in a voice still lower, "if you are interested in the science of numbers!"

"Really. And what number do you think might interest me?"

"Seventy-six—for example."

"Oh," said the other; "in that case I shall mention the very interesting number, Seventy. And you, Miss Erith?" turning to the yellow-haired girl. "Have you any number to suggest that might interest me?"