A few times each month, second graders at a charter school in Springfield, Mass., take time from math and reading to engage in philosophical debate. There is no mention of Hegel or Descartes, no study of syllogism or solipsism. Instead, Prof. Thomas E. Wartenberg and his undergraduate students from nearby Mount Holyoke College use classic children’s books to raise philosophical questions, which the young students then dissect with the vigor of the ancient Greeks.

“A lot of people try to make philosophy into an elitist discipline,” says Professor Wartenberg, who has been visiting the school, the Martin Luther King Jr. Charter School of Excellence, since 2007. “But everyone is interested in basic philosophical ideas; they’re the most basic questions we have about the world.”

One afternoon this winter, the students in Christina Runquist’s classroom read Shel Silverstein’s “Giving Tree,” about a tree that surrenders its shade, fruit, branches and finally its trunk to a boy it has befriended. The college students led the discussion that followed — on environmental ethics, or “how we should treat natural objects,” as Professor Wartenberg puts it — with a series of questions, starting with whether the boy was wrong to take so much from the tree.

“We don’t actually try to convince them that trees deserve respect,” he says, “but ask them, ‘What do you think?’ We’re trying to get them engaged in the practice of doing philosophy, versus trying to teach them, say, what Descartes thought about something.”