The merchant's public counting-house: or, New Mercantile Institution: wherein is shewn, the necessity of young merchants being bred to trade with greater advantages than they usually are. With a practicable plan for that purpose Also some remarks on the benefit of this institution to the young nobility and gentry, and such who are intended for the study of the law. By Malachy Postlethwayt, Esq; the plan to be carried into execution by him and company