The instance is not an isolated one, and in some cases the headquarters at Berlin, realising that a man or woman knows enough to be dangerous, deliberately betrays the person concerned to the authorities of some other Power, with a view to removing dangerous evidence, by means of imprisonment, until such time as the evidence shall be no longer dangerous. Such a case, undoubtedly, was that of the man Graves, whose arrest was largely due to a wrongly addressed letter sent to him from his headquarters--or at the instigation of his headquarters. The system pursued at the German headquarters is such that mistakes are not made by accident, but, if they occur, there is a definite purpose behind them. Graves knew too much, and suffered for it; he was a clever man and a good spy--but there were others equally good, and, since he had come to know more than the heads of the German secret service thought fit, he was removed, by being imprisoned in an English prison, to a point where his knowledge was no longer available for his own use. It may be urged that, in view of the nature of the work involved in espionage duty, it would be hard to find people to undertake that duty, at least, to the extent alleged in the case of the German Empire and its secret service. Such a contention as this, however, proves ignorance of the German, and especially of the Prussian character and way of viewing moral problems. In this connection it is worthy of note that Herr Richter, the leader of the Opposition in the Reichstag, once raised a protest with regard to "the more than doubtful morality of the individuals employed" in the police service of the country; that is, the persons employed in secret police work. In reply, the Minister for the Interior, Von Puttkamer, stated that "it is the right and duty of the State to employ special and extraordinary methods, and even if that honest and estimable functionary, Police-Councillor Rumpff, has employed the methods of which he is accused, in order to secure for the State the benefits of useful intelligence, I here publicly express to him my satisfaction and thanks."