These are hot bearings, loose keys, and leaky joints. If a bearing heats continually, when properly adjusted and well lubricated, it is too small. Sometimes bearings heat on account of dirt or grit, because they are set up too tightly, or are out of line. A hot bearing can often be cooled without stopping the engine, by mixing sulphur or black-lead with the oil, or by turning on a stream of water from a hose. If a joint blows out it, can sometimes be wedged, so that the engine can he run until slopping time. An engineer should exercise all his ingenuity to overcome a difficulty without stopping the engine, except in cases where it would be dangerous to continue to run. If keys or bolts become loose, it will generally be indicated by a thump in the engine. To prevent the freezing of pipes and connections in exposed situations, they should either be thoroughly drained, or the water should be kept circulating in them. B.