This causes the blister to rise above the surrounding skin.

If you puncture the blister the water runs out.

Now we may easily remove the cuticle and examine it.

The cuticle, we shall find, looks very much like the skin which lines the inside of an egg-shell, and it is almost as thin.
~4.~ The cuticle is very thin in most parts of the body, but in some places, as the palms of the hands and the soles of the feet, it is quite thick.

This is because these parts of the skin come in contact with objects in such a way as to be liable to injury if not thus protected.
The cuticle has no blood-vessels and very few nerves.