VENTILATION OF SEWERS.
Duty of dealing with noxious sewer vapours -- Germ theory and open
ventilation -- Open shafts and objections to them -- Shafts against
dwellings -- Use of rainwater pipes -- Use of lamp posts -- Charcoal
trays -- Use of chimney shafts -- Lofty shafts -- Failure of furnaces
-- List of methods tried -- Annihilation of sewer gas -- Composition
of sewer gas -- Direction of flow -- Importance of disconnecting house
drains 271