Our task is done. We have told, as far as we are capable of telling, the secrets of this great and growing city. Our purpose has been two- fold, to satisfy a reasonable curiosity on the part of those who never have seen, and probably never will see New York, and to warn those who design visiting the city, of the dangers and temptations which await them here. We warn them earnestly to confine their visits to the numerous harmless and innocent attractions of the Metropolis, and to shun those other, darker quarters of the city, which are but so many gateways to the paths that lead down to ruin and death.