Do not sleep in native shacks in the tropics.
Do not rub the eyes with dirty hands. When dirt gets in have a doctor get it out.
If you have clap, do not rub your eyes with your hands, and wash your hands well with soap and water after taking treatment or passing water.
Do not handle dogs or cats, especially strange or sickly ones.
Do not clean the ears with sticks or straws,—have a doctor do it for you.
Do not have cheap, advertising dentists fix your teeth. Have the army dentist fix them and see him at least once every six months,—or see a good civilian dentist.
Do not have pictures tattooed on your skin.
Do not smoke other men's pipes.
Do not handle or touch wounds with anything but a first aid package.
Beware of chipped drinking glasses in cafés, restaurants and other places. The slightest cut from such a glass whoso clipped part has been in contact with the mouth of a syphilitic person will give you syphilis.