By the vacuum process the dust is sucked up through the tube into the storing receptacle.] In cleaning a room and its furniture, it is always best to use a carpet sweeper, a vacuum cleaner, or a damp cloth, as much as possible, the broom as little as may be, and the feather duster never.

The two latter stir up disease germs resting peacefully on the floor or furniture, and set them floating in the air, where you can suck them into your lungs.
There are three great groups of disease germs which may be found floating in the air wherever people are crowded together without proper ventilation--for most of these disease germs cannot live long outside of the body, and hence come more or less directly from somebody else's lungs, throat, or nose.

The most numerous, but fortunately the mildest group, of these are the germs of various sorts which give rise to _colds_, _coughs_, and _sore throats_.

Then there are two other exceedingly deadly germs, which kill more people than any other disease known to humanity--the bacillus of consumption, and the coccus of pneumonia.
Our best protection against all these is, first, to have our rooms well ventilated, well lighted, and well sunned; for most of these germs die quickly when exposed to direct sunlight, and even to bright, clear daylight.

The next most important thing is to avoid, so far as we can, coming in contact with people who have any of these diseases, whether mild or severe; and the third is to build up our vigor and resisting power by good food, bathing, and exercise in the open air, so that these germs cannot get a foothold in our throats and lungs.
Colds.