Let a Flannel or woollen belt be worn round the belly.

xvi. Let Personal Cleanliness be carefully observed.

xvii. Let every cause tending to depress the moral and physical
energies be carefully avoided. Let exposure to extremes of heat and
cold be avoided.

xviii. Let Crowding of persons within houses and apartments be
avoided.

xix. Let Sleeping in low or damp rooms be avoided.

xx. Let Fires be kept up during the night in sleeping or adjoining
apartments, the night being the period of most danger from attack,
especially under exposure to cold or damp.

xxi. Let all Bedding and clothing be daily exposed during winter and
spring to the fire, and in summer to the heat of the sun.

xxii. Let the Dead be buried in places remote from the habitations of
the living. By the timely adoption of simple means such as these,
cholera, or other epidemic, will be made to lose its venom.

[THE LOVELIEST BIRD HAS NO SONG.]

909. Rules for the Preservation of Health.

910. Fresh Air.

Pure atmospheric air is composed of nitrogen, oxygen, and a _very_
small proportion of carbonic acid gas. Air once breathed has lost the
chief part of its oxygen, and acquired a proportionate increase of
carbonic acid gas.

_Therefore_, health requires that we breathe the same air once only.

911. Diet and Exercise.

The solid part of our Bodies is continually wasting, and requires to
be repaired by fresh substances.

_Therefore_, food which is to repair the loss, should be taken with
due regard to the exercise and waste of the body.

912. Water.

The fluid part of our bodies also wastes constantly; there is but one
fluid in animals, which is water.

_Therefore_, water only is necessary, and no artifice can produce a
better drink.

913. Proportion of Food and Drink.

The fluid of our bodies is to the solid in proportion as nine to one.

_Therefore_, a like proportion should prevail in the total amount of
food taken.

914. Sunshine.

Light exercises an important influence upon the growth and vigour of
animals and plants.

_Therefore_, our dwellings should freely admit the solar rays.

915. Bad Odours.

Decomposing animal and vegetable substances yield various noxious
gases which enter the lungs and corrupt the blood.

_Therefore_, all impurities should be kept away from our abodes, and
every p