"I came," she explained, "to ask you to lend me Professor Paulson's book on reindeer-moss. Will you tell me where it is and let me get it for myself, if Ostrog doesn't mind?"

To her surprise, Julian allowed her to find it for herself. Ostrog continued to growl, but without immediate menace. When she had found it, she took it across to Julian.

"Please don't run away," he said quickly, "unless you want to. Tell me what you intend to look up about the moss. I had a little tussle with Paulson over it once. He was an awfully able fellow, but he hadn't the health to get at his facts at first hand. That was unfortunate; second-hand accuracy leaks."

Stella sat down near him, and in a minute they were launched into an eager discussion. She had typed the book herself, and had its facts at her fingers'-end. She presented a dozen facets to her questions, with a light on them from her dancing mind.

Julian differed, defended himself, and explained, till he found himself at length in the middle of an account of his last expedition. He pulled himself up abruptly.

"By Jove!" he exclaimed, "what a dark horse you are! Do tell me how you come to know anything about such a subject. Did you smuggle yourself into an Arctic expedition as a stowaway, or have you been prospecting gold at Klondike with a six-shooter and a sleeping-sack? It's amazing what you know about the North."

"It is not so uncanny as you think," said Stella, quietly. "I was Professor Paulson's secretary. For five years I studied the fauna and flora of arctic regions. I used to help him examine the tests brought back by explorers. He taught me how to understand and check climate and weather charts. All the collected specimens went through my hands. I did the drawings for this book, for instance. You know, a secretary is a kind of second fiddle. Give him a lead, and he catches up the music and carries it through as thoroughly, though not so loudly, as the first violin. I like being a second fiddle and I like the North."

"That's odd," said Julian, drawing his heavy eyebrows together. "I had an idea I had met Professor Paulson's secretary before."

"You are quite right," said Stella; "you did meet her before."

Julian stared at her; his eyes hardened.