Polished Iron (To Preserve). Polished ironwork may be preserved from rust by a mixture not very expensive, consisting of copal varnish intimately mixed with as much olive oil as will give it a degree of greasiness, adding thereto nearly as much spirit of turpentine asof varnish. The cast-iron work is best preserved by rubbing it with blacklead. But where rust has begun to make its appearance on grates or fire-irons, apply a mixture of tripoli with half its quantity of sulphur, intimately mingled on a marble slab, and laid on with a piece of soft leather or emery and oil may be applied, with excellent effect; not laid, on in the usual slovenly way, but with a spongy piece of the fig-tree fully saturated with the mixture. This will not only clean but polish, and. render the use of whiting unnecessary.