4. As the blood flows from the heart, through the arteries, it gives
nourishment to every part of the body, and carries away the impurities it
meets, which makes it black and thick; when it comes through the veins,
back to the heart, it is not fit to be used, so it goes to the lungs to be
purified by the fresh air; then it returns to the heart to be sent again
throughout the body; this happens once in from three to eight minutes, and
is called the circulation of the blood.
7. If I would be healthy,
my blood must be pure and circulate freely all the time.
8. It will not circulate freely,
if I wear tight clothing,
if I do not exercise in work or play,
if I do not keep my body warm.
9. It will be impure,
if I breathe bad air,
if I eat unwholesome food,
if I drink alcoholic liquors,
if I snuff, smoke, or chew tobacco.
* * * * *
QUESTIONS FOR THE FORMULA.
1. Tell about the heart and where it is placed.
2. Tell about the blood and of what it is made.
3. Where does the good blood pass after it is sent out from the heart?
4. Tell what the blood does as it flows through the body.
5. What is this flowing of the blood to and from the heart called?
6.
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