INSURANCE ON THE DEAN RICHMOND - It having been ascertained that the insurance companies were averse to taking full risks on the Dean Richmond, and her cargo, for a trip to Liverpool, the Chicago Board of Trade have undertaken to effect the object by individual subscriptions, the Chicago insurance companies taking each a risk of $2,500. The whole amount had not been made up on Saturday, but will be before the vessel leaves Milwaukee, as our businessmen feel too great an interest in the experiment of shipping grain direct from Chicago to Europe, to allow the opposition of Eastern insurance companies to stand in the way. We doubt not that the owners of the vessel, C.Y. Richmond and Capt. Pierce, would go on without insurance and at their own risk, relying on their splendid vessel and "good luck" rather than fail in the experiment. But they will not be compelled to do so.