"You have already heard about the black birch," replied his governess, "and, besides this, we have the white, or gray, birch, the bark of which is white, chalky and dotted with black; the red birch, with bark of a reddish or chocolate color; the yellow birch, bark yellowish, with a silvery lustre; and the canoe birch, which has a white bark with a pearly lustre. There is also a dwarf, or shrub, birch. The list, you see, is quite a long one."