There was yet another possibility which occurred to both their minds at this moment. It was possible that no letter would ever reach Stretton again; that Warrisden, searched he never so thoroughly, would not be able to find the man he searched for. There are so many graves in the Sahara. But neither of them spoke of this possibility, though a quick look they interchanged revealed to each its presence in the other's thoughts. "Besides, he wanted to lie hidden. So much I know, who know nothing of his story. Would he have enlisted under his own name, do you think? Or even under his own nationality? It is not the common practice in the Foreign Legion. And that's not all. Even were he soldiering openly under his own name, how will you address your letter with any likelihood that it will reach him? Just 'La Legion Etrangère'? We want to know to what section of la Legion Etrangère he belongs. Is he chasseur, artilleryman, sapper? Perhaps he serves in the cavalry. Then which is his squadron? Is he a plain foot soldier? Then in what battalion, and what rank does he occupy? We cannot answer any of these questions, and, unanswered, they certainly delay your letter; they may prevent it ever reaching him at all." Pamela laid down her pen and stared blankly at "Warrisden. He piled up the objections one by one in front of her until it seemed she would lose Tony once more from her sight after she had got him for a moment within her vision. "So you had better entrust your letter to me," he concluded. "Address it to Stretton under his own name. I will find him, if he is to be found, never fear. I will find him very quickly." Pamela addressed the letter. Yet she held it for a little time in her hand after it was addressed. All the while Warrisden had been speaking she had felt an impulse strong within her to keep him back; and it was because of that impulse, rather than with any thought of Millie Stretton and the danger in which she stood, that Pamela asked doubtfully-- "How long will you be?" "I should find him within ten days." Pamela smiled suddenly. "It is not so very long," said she; and she handed the letter across to Warrisden. "Well, go!" she cried, with a certain effort. "Telegraph to me when you have found Tony. Bring him back, and come back yourself." She added, in a voice which was very low and wistful, "Please come back soon!" Then she rose from the table, and Warrisden put the letter in his pocket and rose too. "You will be at home, I suppose, in ten days?" he said. And Pamela said quickly, as though some new idea had just been suggested to her mind-- "Oh, wait a moment!" She stood quite still and thoughtful. There was a certain test by which she had meant to find the soundings of heart. Here was a good opportunity to apply the test. Warrisden would be away upon his journey; she could not help Millie Stretton now by remaining in England. She determined to apply the test.