- 27 =

{b) Frost bites
(c) Freezing

High temperatures .

 

High temperatures are of more immediate interest.

Heat Stroke--the cause of 300 to 400 deaths in the United States ©
annually. 1t is the result of hot moist atmosphere marked by headache,
rapid pulse and respiration, loss of conscioumess, and sometimes death.

Burns--may vary in effect from simple redness to cremation. In 1924,
6895 persons were accidentally burned to death and in addition 1625 lost
their lives in conflagrations.

Cost: (a) Bceonomic, (bd) Vital.

Defensive hygiene of increased temperatures

Light is an important source of both health em ill health,

 

The effects of light my be summed up under tle following heads:

(a) Insufficient light may affect eyes or have relation to rickets
in children.

(ob) Excessive licht-—-"sun stroke," sunburn.

(c) X-Rays or Radium may injure as well as aid health.

Electricity my be an important cause of ill health and death unless
proper defensive hygiene measures are taken.

(a) Lightning
(b) Commercial electricity

Defenses

(<) Safeguarding
(b) Education

References: Storey--Defensive Hygiene, Chapter 15.
Rosenau-—Preventive Medicine--Articles on Pressure, Tom-
perature, and Light.
Huntington--Civilization and Climate.
Sunset Magazine--What Price California Climate, June, 1928.
uckiesh and Pacini--Light and Health

DISCUSSION QUESTIONS:

 

1. Discuss the relation of aviation to health.

2. Why are the respirations quickened when the atmospheric pressure is
diminished?

3. Explain the increased number of red cells produced under same con=
ditions. “

4, Ontline a defensive hygiene program against Caisson's disease.