The need of cleanliness is particularly great for those who work in

factories, mines, and other places where dirt is likely to be carried to
the mouth by the hands
The need of cleanliness is particularly great for those who work in
factories, mines, and other places where dirt is likely to be carried to
the mouth by the hands. Probably many diseases get a foothold in this
way without the victim realizing in the least that they were due to his
carelessness and lack of cleanliness.