"These are the pitch-pines," replied their governess. "They are the roughest of all our forest-trees, and they have a rounder head than any of the other American evergreens. The branches, you see, turn in various directions and are curved downward at the ends. This tree has also the peculiar habit of sending out little branchlets full of leaves along the stem from the root upward, and this has a very pretty effect, like that of some elm trees. It is the pitch-pine that produces the fragrance we are all enjoying so much. What do you notice about the smoother trees?"