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isolated in hospitals. The 170 cases notified from Poplar belonged
to 146 houses, of which 54 were found by the smoke test to have
defective drains, and the 356 cases notified in Bromley were from 295
houses, of which number 70 were found to have defective drains;
in conjunction with this, it has to be remembered, that, as the drains
were only tested with smoke, those houses where no defects were
revealed might still have defective drains, in those instances in which
the pipes are covered with a deep layer of earth, and soil pollution
might be going on to an alarming extent, and contaminating the
ground air.