out as _wigglers_ or
_larvae_, which have to come to the top frequently to breathe. In
about twelve days or longer they turn into _tumblers_ or _pupas_,
which in a few days longer come to the top when their backs split open
and the mosquito comes out and flies away.

[Illustration: Fig. 10

_The eggs_

_The larvae_

_The pupa_

_The mosquito leaving the pupa skin_]

_The malaria mosquito_ is domestic like the chicken and lives around
in houses hiding in the grass, bushes or dark corners and comes out to
bite at night. When a settlement is abandoned the malaria mosquito
moves away also. She rarely flies far from home and is not found much
beyond 500 yards from a house. She lays her eggs in running clear
water preferably, but she will accept water in hollow trees, between
the leaves of lilies or air plants or in vases of flowers, or in
cisterns and water butts.

[Illustration: Fig. 11

_Catching malaria_]

[Illustration: Fig. 12

_On Guard_

(No mosquito bites for him)]

_The yellow fever mosquito_ is domestic like the house cat. She hangs
around the house and rarely flies as far as the next house even,
preferring to travel on a visitor's coat. She will bite in the day
time and will lay her eggs in any little collection of water in the
house, the eaves trough, the water barrel, old tin cans or bottles,
pitchers, vases or the refrigerator drip.

_The dengue_ mosquito is a marsh and town mosquito. She flies far and
well and will breed in any sort of water, even brackish.

_To kill mosquitoes_--

Catch them in the house; empty all water from tin cans, old barrels,
etc; cover with wire all cisterns and water barrels; fill in all
puddles and drain off marshes; put oil on all pools and streams to
choke the wrigglers; cut down grass and bushes around houses.

CHAPTER II

PERSONAL HYGIENE

=1470.= The knowledge of taking care of the body is called _Personal
Hygiene_, the principal rules of which are as follows:

1. KEEP THE SKIN CLEAN.
2. KEEP THE BODY PROPERLY PROTECTED AGAINST THE WEATHER.
3. KEEP THE BODY PROPERLY FED.
4. KEEP THE BODY SUPPLIED WITH FRESH AIR.
5. KEEP THE BODY WELL EXERCISED WITHOUT EXHAUSTION.
6. KEEP THE BODY RESTED BY SUFFICIENT SLEEP.
7. KEEP THE BODY FREE OF WASTES.

Sanitation is the practice of the laws of Hygiene.

=1471. RULE 1. Keep the Skin clean.= A dirty body invites sickness.
Small troubles such as chafing, sore feet, saddle boi