As he rushed in, they followed. One of them was gaining on him and took a flying football tackle. The other almost fell over the twisted mass of arms and legs. The struggle now was short and sharp and ended in the officers slipping the bracelets over the wrists of Smith. While the passengers and bystanders crowded about to watch the excitement, they led him off quickly.

. . . . . . .

In his rooms at the St. Germain, cluttered with test tubes and other paraphernalia which indicated his scientific tendencies, Professor Arnold entered and threw off his hat, lighting a cigarette and waiting impatiently.

He had not as long to wait as he had expected. A knock sounded at the door and he opened it. There was Smith handcuffed and forced in by the two policemen.

"Good work," commended Arnold, at once setting to work to search the prisoner who fumed but could not resist.

"What have we here?" drawled Arnold in mock courtesy and surprise as he found and drew forth from Smith's pocket a bundle of papers, which he hastily ran through.

"Ah!" he muttered, coming to Del Mar's note, which he opened and read. "What's this? 'A. A. L. N. Y. Closely watched. Must act soon or all will be discovered. M.' Now, what's all that?"

Arnold pondered the text deeply. "You may take him away, now," he concluded, glancing up from the note to the officers. "Thank you."

"All right, sir," they returned, prodding Smith along out.

Still studying the note, Arnold sat down at the desk. Thoughtfully he picked up a pencil. Under the letters A. A. L. he slowly wrote "Anti-American League" and under the initial M the name, "Martin."