It is not so wonderful that the far earlier allusion to these facts by the
younger Bartram should have been overlooked or disregarded. With the genuine
love of Nature and fondness for exploration, 'William Bartram did not
inherit the simplicity of his father, the earliest native botanist of this
country. Fine writing was his foible; and the preface to his well-known
"Travels" (published at Philadelphia in 1791) is its full-blown
illustration, sometimes perhaps deserving the epithet which he applies to
the palms of Florida--that of pomposity. In this preface he declares that
"all the Sarracenias are insect-catchers, and so is the Drosera
rotundifolia. Whether the insects caught in their leaves, and which
dissolve and mix with the fluid, serve for aliment or support to these kind
of plants is doubtful," he thinks, but he should be credited with the
suggestion. In one sentence he speaks of the quantities of insects which,
"being invited down to sip the mellifluous exuvia from the interior surface
of the tube, where they inevitably perish," being prevented from returning
by the stiff hairs all pointing downward. This, if it refers to the sweet
secretion, would place it below, and not, as it is, above the bristly
surface, while the liquid below, charged with decomposing insects, is
declared in an earlier sentence to be "cool and animating, limpid as the
morning dew." Bartram was evidently writing from memory; and it is very
doubtful if he ever distinctly recognized the sweet exudation which entices
insects.
Why should these plants take to organic food more than others? If we cannot
answer the question, we may make a probable step toward it. For plants that
are not parasitic, these, especially the sundews, have much less than the
ordinary amount of chlorophyll--that is, of the universal leaf-green upon
which the formation of organic matter out of inorganic materials depends.
These take it instead of making it, to a certain extent.
What is the bearing of these remarkable adaptations and operations upon
doctrines of evolution? There seems here to be a field on which the
specific creationist, the evolutionist with design, and the necessary
evolutionist, may fight out an interesting, if not decisive, "triangular
duel."
XI
INSECTIVOROUS AND
CLIMBING PLANTS [XI-1]
(The Nation, January 6 and 13, 1876)
Public-domain text, read in full here on John Shaqi.
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