The running of pipes and conduits in fireproof buildings brings forward a system, differing in some essentials from the ordinary piping of buildings with wooden floors. In the first place, less cutting of material is available to make spaces for pipes, and so more careful consideration must be given to this matter in the early stages of the construction; and again the necessity of leaving no continuous channels or connection from one floor to another, which would allow the passage of fire, will require that the pipes be run in exposed situations as far as possible, so that the floor material may be filled closely around each pipe. This is a point that the superintendent will need to keep constantly in mind and be sure that it is done in every case.