"What do they hold?"

"They hold what are called _spores_; that is, little bits of things
which, whenever they get a chance, begin to grow and make new plants."

"Seeds?" said Daisy.

"They answer the purpose of seeds."

"How do they get out of the basket? do the winds blow them out?"

"Or the rain washes them out. If they lie long enough in the basket,
they will take root there, and then there is a new plant seen growing
out of the old one."

"How wonderful it is!" said Daisy.

"There is another wonder about it. It does not matter which way these
little spores lie on the ground or in the basket; but the side that
happens to be exposed to the light, after a time, prepares itself to
expand into the surface of a frond, while the dark side sends down a
tiny root."

"And it does not matter which side lies uppermost?"

"No, not in the beginning."

"What is a _frond_, Dr. Sandford?"

"This sort of seed-bearing leaf is called so."