When the streets were slippery with frost or snow that was the worst of all for us horses. One mile of such traveling, with a weight to draw and no firm footing, would take more out of us than four on a good road; every nerve and muscle of our bodies is on the strain to keep our balance; and, added to this, the fear of falling is more exhausting than anything else. If the roads are very bad indeed our shoes are roughed, but that makes us feel nervous at first.