where he lodged, the address used by me was as probable as any other; what more natural and commendable than that I should write to cheer him up a bit in exile, and that I should send him books and illustrated magazines? If it had been noticed by the postal authorities in Holland that my friend did not live at the address which I used, it would have been supposed that I had made a mistake, and no suspicion would have been attracted to me. But how did my letters, books, and magazines containing information, the most secret and urgent, pass through the censorship unchecked? That again was simple. My letters were those which a friend in freedom in England would write to his friend who was a captive in Holland. They were personal, sympathetic, no more. The books and magazines were just those which such a man as my friend would desire to have to lighten the burden of idleness. Between the lines of my letters, and on the white margins of the books and papers, I wrote the vital information which my country desired to have, and I desired to give. The ink which I used for this purpose left no trace and could not be made visible by any one who had not its complementary secret. It is the special ink of the Austrian Secret Service; you do not know it, your Censors do not know it, your chemists might experiment for months and years and not discover it. I used it always, and you never read what I wrote. Now you will understand why I wish the small stock of money, my police pay, which I could not myself have used without dishonour, to go to the interned sailors in Holland. I feel that I owe to my friend some little reparation for the crooked use to which I have put his name.