The field had become alive in layers.
Clara wrote everything down.
One morning after a hard overnight rain, she walked to the field expecting water.
Two inches had fallen.
In past years, the drowned land would have been a shallow lake for days.
This time, water remained only in the lowest depressions.
The rest of the field was wet but passable.
She found Vance before noon.
He came with measuring rods and stayed until evening.
They compared the willow area to a bare section near the west fence.
Water infiltrated faster near the roots.
Not dramatically everywhere, but consistently enough that Vance repeated the test three times.
He crouched beside the final hole and stared at the dark soil.
“Your grandmother understood hydrology without calling it hydrology.”
“She understood the field.”
“Yes.”
“Maybe that’s the same thing.”
Vance sat back on his heels.
“Science is supposed to begin with observation.”
“Does it?”
“It should.”
“What happened to it?”
He looked at her.
“We sometimes become too impressed with what we already know.”
Clara thought of all the men who had laughed.
“People do that without college too.”
“Fair correction.”
He took more soil samples.
Two weeks later, he came back excited enough to forget his hat in the car.
“Organic matter is increasing.”
“How much?”
“Not enough yet to explain all of the structural changes, but enough to measure.”
He showed her the results.
The numbers meant little without context.
He explained them.
Flood sediment had brought nutrients. Willow roots had created channels. Fine roots died and regrew. Microorganisms used the new carbon sources. Leaves and twigs gathered at the surface instead of blowing away because the young trees trapped them.
“It’s a feedback system,” he said.
“What does that mean?”
“One change makes another possible, and the second change strengthens the first.”
Clara looked over the grove.
“Like people.”
Vance hesitated.
“I was speaking about soil.”
“I know.”
He smiled.
The bank came again at the end of June.
This time Henderson did not wear his good shoes.
He arrived in old boots.
Clara noticed immediately.
“So circumstances have changed enough for mud?” she asked.
“Experience is an educational institution.”
They walked the field together.
The willows stood three to four feet tall.
Henderson touched one cautiously.
“Mr. Vance says this area may have improved drainage characteristics.”
“Mr. Vance enjoys saying things like that.”
“What do you say?”