Vowels.

My first a baby does when you pinch it;

My second a lady says when she doesn’t mean it;

My third exists and no one e’er has seen it;

And my whole contains the world’s best half within it.

Cri-no-line.

Formed long ago, yet made to-day,

I’m most employed while others sleep;

What none would like to give away,

Yet no one likes to keep.