Iris, The Happy ProfessorSeason 414 episodesEpisodes1StampsProfessor Iris is on vacation, so Ms. Principal is teaching the class. Throughout her lesson, she and the class receive letters from the Professor, who asks that all the stamps on the envelopes go to Piano's collection.2Learning3Rodents4My Eyes5Hats6Bats7The Moon8My Teeth9Books10Snakes11Taste12Puppets13Balloons14Stringed InstrumentsSeason 1Season 2Season 3
