Read it through once

I will not give you the trick; it is not worth the trouble, and I do not care to be the means of intimating how cheap a fellow can, if he likes, make himself appear to be in company with such people as pickpockets and confidence-men. Besides, I am not sure that it is worth while to publish these things; if one does, the other fellows get the notion and practise the trick, and it becomes so well known that no one can be taken in by it any more.