But Nature has made for us an ingenious organ by means of which we can feel these very fine vibrations as well as loud ones.

We call this organ the _ear_.
~4.

The Ear.~--The part of the ear which we can see is shaped somewhat like a trumpet.

The small opening near the middle of the ear leads into a _canal_ or tube which extends into the head about an inch.

At the inner end there is a curious little chamber.