fruits, and always afterwards recur to the scenes of their tropical
visit with an excited imagination.

In countries near the equator, many plants which are herbs in our
latitude assume arborescent forms. Such are the Tree-Grasses, which form
impenetrable forests, equalling some of the Fir woods of the North in
extent, if not in beauty and grandeur. In this part of the world we know
the Ferns only as a low herbaceous tribe of plants, consisting of mere
fronds rising out of the ground. We admire them for their beautifully
compounded leaves, and their colors of red, orange, and russet that
variegate our meadows in June, their garlands of verdure upon the rocky
hills in winter, and the profusion of their frondage in the shady glens
in summer. But in certain parts of the equatorial zone the Ferns put
off the humble guise in which they appear at the North. They no longer
associate with the lowly Violet, allowing themselves to be crowded by
the Hellebore and overtopped by the Meadow Rue; but they rear their
branches aloft and assume the dignity and stature of trees. Man, who
looks down upon them in our own latitude, and tramples them under
his feet, looks in that region far above his head, and beholds their
magnificent fronds spread out like a great tent between him and the
heavens.

Tree-Ferns, though confined principally to the equatorial zone, are
unable to endure the heat of the plains. They occupy an elevation that
affords them the continual temperature of spring, three thousand feet
above the sea,--the region of the lowest stratum of clouds,--where they
receive the benefit of their moisture before it descends to the earth
in showers. Humboldt ranks them with the noblest forms of tropical
vegetation,--less lofty than the Palms, but surpassing them in beauty of
foliage. The arborescent Ferns and Grasses are true specimens of those