Pine woods provide
this relief, and cause the tinted forest groups to stand out in greater
prominence. In many districts where Pines were the original growth, they
still constitute the larger sylvan assemblages, while the deciduous
trees stand in scattered groups on the edge of the forest, and the
contiguous plain. The verdurous Pine wood forms a picturesque groundwork
to set off the various groups in front of it; and the effect of a
scarlet Oak or Tupelo rising like a spire of flame in the midst of
verdure is far more striking than if it stood where it was unaffected by
contrast.

The cause of the superior tinting of the American forest, compared with
that of Europe, has never been satisfactorily explained, though it
seems to be somewhat inexplicably connected with the brightness of the
American climate. It is a subject that has not engaged the attention of
scientific travellers, who seem to have regarded it as worthy only of
the describer of scenery. It may, however, deserve more attention as a
scientific fact than has been generally supposed,--particularly as one
of the phenomena that perhaps distinguish the productions of the eastern
from those of the western coasts of the two grand divisions of the
earth. I have observed that the Smoke-tree, which is a Sumach from
China, and the Cydonia Japonica, are as brightly colored in autumn as
any of our indigenous shrubs; while the Silver-Maple, which, though
indigenous in the Western States, probably originated on the western
coast of America, shows none of the fine tinting so remarkable in the
other American Maples. These facts have led me to conjecture that this
superior tinting of the autumnal foliage may be peculiar to the
eastern coasts both of the Old and the New Continent, in the northern
hemisphere. May not this phenomenon bear some relation to the colder
winters and the hotter summers of the eastern compared with the western
coasts? I offer this suggestion as a query, not as a theory, and
with the hope that it may induce travellers to make some particular
observations in reference to it.

The indigenous trees of America, or rather of the Atlantic side of this
continent, are remarkable not only for their superior autumnal hues,
but also for the shorter period during which the foliage remains on the
trees and retains its verdure. Our fruit-trees, which are all exotics,
retain their foliage long after our forest-trees are leafless; and if
we visit an arboretum in t