CHAPTER X.
A DROP OF BLOOD.
~1.

The Blood.~--Did you ever cut or prick your finger so as to make it bleed?
Probably you have more than once met with an accident of this sort.

All parts of the body contain blood.

If the skin is broken in any place the blood flows out.
~2.~ How many of you know what a microscope is?
It is an instrument which magnifies objects, or makes them look a great deal larger than they really are.

Some microscopes are so powerful that they will make a little speck of dust look as large as a great rock.
~3.