ONCE upon a time, many years ago-when our grandfathers were little children-there was a doctor; and his name was Dolittle-John Dolittle, M.D. "M.D." means that he was a proper doctor and knew a whole lot. He lived in a little town called, Puddleby-on-the-Marsh. All the folks, young and old, knew him well by sight. And whenever he walked down the street in his high hat everyone would say, "There goes the Doctor!-He's a clever man." And the dogs and the children would all run up and follow behind him; and even the crows that lived in the church-tower would caw and nod their heads.