...enjamin sent over to-day extracts from dispatches from Mr. Slidell and a Mr. Hotze, agent, showing how the government is swindled in Europe by the purchasing agents of the bureaus here. One, named Chiles , in the purchase of $650,000, Mr. Slidell says, was to realize $300,000 profit! And Mr. Hotze (who is he?) says the character and credit of the government are ruined abroad by its own agents! Mr....