MUD.
Mud is the most universal impurity of feed-water; and, in many cases, it causes the destruction or injury of sheets, particularly the crown-sheets of fire-boxes. Where the water of a road is habitually muddy, it would pay to filter the water, or to have two tanks at each water station, so that a system could be followed of letting the water settle in one tank while the other was in use. The settled mud, by this means, could be washed out regularly before a tank were refilled.