The practice of selling by commission, the same as I have shown to prevail among the costers, exists among the miscellaneous dealers of whom I am treating, who are known among street-folk as "swag-barrowmen," or, in the popular ellipsis, "penny swags;" the word "swag" meaning, as I before showed, a collection—a lot. The "swag-men" are often confounded with the "lot-sellers"; …