water of a very impure kind is used for domestic purposes. And when epidemic disease shows itself, persons using such water are almost sure to suffer.
3. It would be curious to ascertain by inspection, how many houses in London are really well drained. Many people would say, surely all or most of them. But many people have no idea in what good drainage consists. They think that a sewer in the street, and a pipe leading to it from the house, is good drainage. All the while the sewer may be nothing but a laboratory from which epidemic disease and ill health is being distilled into the house. No house with any untrapped drain pipe communicating immediately with a sewer, whether it be from water-closet, sink, or gully-grate, can ever be healthy. An untrapped sink may at any time spread fever or pyæmia among the inmates of a palace.
The ordinary oblong sink is an abomination. That great surface of stone, which is always left wet, is always exhaling into the air. I have known whole houses and hospitals smell of the sink. I have met just as strong a stream of sewer air coming up the back staircase of a grand London house from the sink, as I have ever met at Scutari; and I have seen the rooms in that house all ventilated by the open doors, and the passages all unventilated by the closed windows, in order that as much of the sewer air as possible might be conducted into and retained in the bed-rooms. It is wonderful.
Another great evil in house construction is carrying drains underneath the house. Such drains are never safe. All house drains should begin and end outside the walls. Many people will readily admit, as a theory, the importance of these things. But how few are there who can intelligently trace disease in their households to such causes! Is it not a fact, that when scarlet fever, measles, or small-pox appear among the children, the very first thought which occurs is, "where" the children can have "caught" the disease? And the parents immediately run over in their minds all the families with whom they may have been. They never think of looking at home for the source of the mischief. If a neighbor's child is seized with small-pox, the first question which occurs is whether it had been vaccinated. No one would undervalue vaccination; but it becomes of doubtful benefit to society when it leads
