For this reason chloride of lime is an excellent disinfectant of drainpipes.

In the course of time they reach the quiet upper reaches of the river or go up rivulets and drainpipes to the isolated ponds.

The drainpipes from the roof have decayed to such a degree that in some instances as little as a quarter of the pipe remains.

Thirdly, it must be perfectly ventilated—not the drainpipes merely,—but the room itself in summer and in winter.