The lesson of "MULE SCHOOL" MULE SCHOOL is a poem with a message that applies to both grown-ups and children. The poem is about a boy name Toby and his mule Elmer. However, within the verses there is a deeper meaning. The poem shows how the boy and his mule must learn certain rules in order to plow the desired "Nice Straight Row." That's not too different than what happens to us in our daily lives. The message in the poem is clear...