In his head you will find several of these nerve knots grown together. And that's little Mr. Crawfish's little brain.
Mother Nature doesn't "cross bridges" until she comes to them; that is, she takes care of the business of every day without bothering herself too much about what she is going to do a long way ahead. She's not like the little girl who got to dreaming how much money she was going to get for her eggs, and then how, by and by, she was going to sell more eggs, and so finally get enough to buy a silk dress. You know, while she was going along thinking of everything but where she was going, she tripped and fell.
And the eggs—!
Mother Nature always has her mind on her day's work. She says: "Give us this day our daily duty, and the doing of it will keep us happy and get us ready for the next duty."