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 neighbour’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 people to look abroad for the source of evils which exist at home.

[Sidenote:  Cleanliness.]

4.  Without cleanliness, within and without your house, ventilation is comparatively useless.  In certain foul districts of London, poor people used to object to open their windows and doors because of the foul smells that came in.  Rich people like to have their stables and dunghill near their houses.  But does it ever occur to them that with many arrangements of this kind it would be safer to keep the windows shut than open?  You cannot have the air of the house pure with dung-heaps under the windows.  These are common all over London.  And yet people are surprised that their children, brought up in large “well-aired” nurseries and bed-rooms suffer from children’s epidemics.  If they studied Nature’s laws in the matter of children’s health, they would not be so surprised.

There are other ways of having filth inside a house besides having dirt in heaps.  Old papered walls of years’ standing, dirty carpets, uncleansed furniture, are just as ready sources of impurity to the air as if there were a dung-heap in the basement.  People are so unaccustomed from education and habits to consider how to make a home healthy, that they either never think of it at all, and take every disease as a matter of course, to be “resigned to” when it comes “as from the hand of Providence;” or if they ever entertain the idea of preserving the health of their household as a duty, they are very apt to commit all kinds of “negligences and ignorances” in performing it.

[Sidenote:  Light.]

5.  A dark house is always an unhealthy house, always an ill-aired house, always a dirty house.  Want of light stops growth, and promotes scrofula, rickets, &c., among the children.

People lose their health in a dark house, and if they get ill they cannot get well again in it.  More will be said about this farther on.

[Sidenote:  Three common errors in managing the health of houses.]