Another class, fully persuaded of the truth of the principle that "seeing is believing," and unwilling to trust in anything less reliable than their own eyes, deposit their letters with the Agent rather than in the post-office, in order to avoid the innumerable perils which might beset them in their passage from the custody of the post master to that of the Agent! These cautious persons are not satisfied without ocular demonstration of the departure of their letters, so that if the letters should fail to reach their destination, they would still have the pleasing consciousness that they had done all in _their_ power to avoid such a catastrophe. Still another class confide their letters to the Route Agent, from a belief that letters, especially valuable ones, will thus go forward more safely and expeditiously. But this is an incorrect idea, for in the first place the pressure of other indispensable duties, such as receiving, assorting, and delivering mails, may occupy so much of the Agent's time that he will find it impossible to mail all the letters handed him, in which case they would often suffer at least a day's delay. And as to the supposed additional safety of money-letters, when sent in this way, it may be remarked that in case of a serious collision happening to the train while the letters were still loose, the chances of their loss from destruction or theft, would be much greater than if they were properly secured in a locked mail-pouch. Important losses have occurred in this way, and of course they may happen at any time. In behalf of the Route Agents, whose duties, at best, are sufficiently arduous, the public are earnestly requested to exercise the privilege referred to only in accordance with its original intention, namely, in reference to letters which _cannot_ with due diligence be mailed in the ordinary way. Another important regulation contained in the Route Agents' instructions, is that which forbids the admission within the mail car of any one except those officially connected with the Department. The strict enforcement of this rule is well for all concerned, and should be cheerfully acquiesced in by the railroad companies and the public at large. Nor should its application in individual cases be construed, as has sometimes been done, into a distrust of the honor or honesty of the person refused admittance. It is done simply in pursuance of a wholesome and reasonable requirement, and with the view to confine responsibility to those upon whom it is placed by the Department, and to guard against hindrances to the faithful and accurate discharge of their duty. The faithfulness of one of the Route Agents, in respect to a compliance with Instructions, was a few years since tested by the Post Master General in person, who happened to be travelling _incog._, so far as those on that train were concerned.