They could hear Mrs.Comstock's tense breath and see her absorbed expression.
"Young people," she said solemnly, "if your studying science and the elements has ever led you to feel that things just happen, kind of evolve by chance, as it were, this sight will be good for you.

Maybe earth and air accumulate, but it takes the wisdom of the Almighty God to devise the wing of a moth.

If there ever was a miracle, this whole process is one.

Now, as I understand it, this creature is going to keep on spreading those wings, until they grow to size and harden to strength sufficient to bear its body.

Then it flies away, mates with its kind, lays its eggs on the leaves of a certain tree, and the eggs hatch tiny caterpillars which eat just that kind of leaves, and the worms grow and grow, and take on different forms and colours until at last they are big caterpillars six inches long, with large horns.