There has been a gradation in time for the vegetable as well as the
animal world. With the marine population of the more ancient geological
ages we find nothing but sea-weeds,--of great variety, it is true, and,
as it would seem, from some remains of the marine Cryptogams in early
times, of immense size, as compared with modern sea-weeds. But in the
Carboniferous period, the plants, though still requiring a soaked and
marshy soil, were aerial or atmospheric plants: they were covered with
leaves; they breathed; their fructification was like that which now
characterizes the ferns, the club-mosses, and the so-called "horse-tail
plants," (_Equisetaceae,_) those grasses of low, damp grounds remarkable
for the strongly marked articulations of the stem.
These were the lords of the forests all over the world in the
Carboniferous period. Wherever the Carboniferous deposits have been
traced, in the United States, in Canada, in England, France, Belgium,
Germany, in New Holland, at the Cape of Good Hope, and in South America,
the general aspect of the vegetation has been found to be the same,
though characterized in the different localities by specific
differences of the same nature as those by which the various floras are
distinguished now in different parts of the same zone.
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