Who introduced the new teacher to the children and how?

(Read the text and answer the question)

The teacher wore a short striped cotton work jacket over his undershirt, a towel around his neck instead of a tie, patched indigo-dyed trousers and workmen's thick, two-toed, rubber-soled socks. On his head, he had a ragged straw hat.

The children were assembled by the pond at Kuhonbutsu Temple and the place was a quiet and pleasant area shaded by trees.

Totto-chan thought she had seen the teacher before but couldn't immediately remember where.

Totto-chan remembered that the farming teacher was the farmer who worked in the field by the stream, which she passed during her walks to Kuhonbutsu.

The teacher smiled and confirmed that he was indeed the farmer she saw near the stream.

The headmaster explained that the man kindly agreed to teach the children how to plant a field, comparing it to a baker teaching how to make bread. That's why the headmaster called the man a teacher.