🖙 The _Boston Traveller_ of Wednesday, June 5th, says, “It is not supposed that counterfeit money is manufactured in this city. The greater part of the money of this description which has for years flooded the country, comes from Canada, where, from various causes, its manufacturers have been left comparatively undisturbed, to carry on their nefarious business. … It is not perhaps an exaggeration to say that traders in our city are cheated out of at least $50,000 annually, by means of counterfeit money.” Now in New York city, which is four times larger than Boston, this system has been pretty generally diffused among the merchants for nine months past, and it may be safely predicted that for the year 1850 there will not be one-tenth, or even a twentieth of the above sum lost here by counterfeits. Men who handle any money should not refuse to expend the trifling sum to learn this system. They should reflect that besides it being against their own interests to remain ignorant of it, their neglect to learn it _is just so much encouragement to counterfeiters_, because the less this system is spread the greater the chance for counterfeit money to circulate and defraud the public; therefore, every honest man should put his shoulder to the wheel to facilitate the diffusion of the system, and thereby assist to drive all spurious money out of circulation. The different periodical Bank-note Lists are excellent guides, _as far as they go_, but they do not and cannot go far enough. They assist too often _after_ the mischief is done. In hundreds of cases their description of counterfeits is necessarily vague and uncertain, especially where the counterfeit is a _fac-simile_ of the genuine: they never make a man a good judge of money _at sight_. But the greatest trouble is that new counterfeits, it is said, are generally “rushed” in upon the community preconcertedly, from different points at once, and the greatest mischief is often done before they have time to get the description in the List. Now this system will enable the poorest judge to detect _any_ counterfeit, _new_ or old, AT SIGHT. It is arranged systematically into seven rules, simple and comprehensive at a glance of the eye. For self-instruction a magnifying glass will be of great assistance at first in learning the principle, and afterwards the naked eye will be sufficient to detect, but it is advisable to always have a glass on hand. Also a few specimens of bills, good and bad, to compare and examine at first is necessary to make the theory practical. The following is the list of RULES: