The Post-office, while it is the willing handmaid to commerce, the vehicle of social intercourse, and the necessary helper in almost every enterprise and occupation, becomes at the same time a ready means for the unscrupulous to carry on a wonderful variety of frauds on the public, and enables a whole army of needy and designing persons to live upon the generous impulses of society. While these things go on,--and Post-office officials know they go on,--the Department is helpless to prevent them; for the work of the Post-office is carried on as a secret business, in so far as the communications intrusted to it are concerned, and the contents of the letters conveyed are not its property or interest. There are men and women who go about from town to town writing begging letters to well-to-do persons, appealing for help under all sorts of pretences; and these persons are as well known, in the sense of being customers to the Department, as a housekeeper is known at her grocer's shop. There are other persons, again, who carry on long-firm swindles through the post, obtaining goods which are never to be paid for; and as soon as the goods are received at one place, the swindlers move on to another place, assume new names, and repeat the operation. The schemes adopted are often very deeply laid; and the police, when once set upon the track, have hard work to unravel the wily plans. But tradespeople are not infrequently themselves very much to blame, as they show themselves too confiding, and too ready to do business with unknown persons. The following is an instance of a fraud upon well-to-do persons in this country, attempted by an American in the year 1869:-- The Rev. Mr Champneys, of St Pancras, London, received a letter posted at Florence, Burlington County, New Jersey, U.S., which upon being opened seemed to be not intended for him, but was a communication purporting to be written from one sister to another. The letter made it appear that the writer was highly connected, had fallen into the greatest distress owing to the death of her husband, that her feelings of self-respect had restrained her from telling her griefs till she could no longer withhold them, and making free use of the deepest pathos and high-sounding sentiments, and finally appealing for an immediate remittance. Mr Champneys, not suspecting a fraud, and desiring to help forward the letter to the person who, as he supposed, should have received it, inserted the following advertisement in the 'Times' newspaper:-- "A letter, dated Florence, Burlington County, New Jersey, U.S., intended for Mrs Lucy Campbell, Scotland, has been misdirected to Rev. W. Champneys, 31 Gordon Square. Will Mrs Campbell kindly communicate her address immediately?"