The Principles of Biology, Volume 1 (of 2)Spencer, Herbert
Science
The Principles of Biology, Volume 1 (of 2)
Spencer, Herbert
Biology
Each uniaxial plant may perhaps fairly be regarded as a distinct
individual; though there are botanists who do not make even this admission.
What, however, are we to say of a multiaxial plant? It is, indeed, usual to
speak of a tree with its many branches and shoots as singular; but strong
reasons may be urged for considering it as plural. Every one of its axes
has a more or less independent life, and when cut off and planted may grow
into the likeness of its parent; or, by grafting and budding, parts of this
tree may be developed upon another tree, and there manifest their specific
peculiarities. Shall we regard all the growing axes thus resulting from
slips and grafts and buds, as parts of one individual or as distinct
individuals? If a strawberry-plant sends out runners carrying buds at their
ends, which strike root and grow into independent plants that separate from
the original one by decay of the runners, must we not say that they possess
separate individualities; and yet if we do this, are we not at a loss to
say when their separate individualities were established, unless we admit
that each bud was from the beginning an individual? Commenting on such
perplexities Schleiden says--"Much has been written and disputed concerning
the conception of the individual, without, however, elucidating the
subject, principally owing to the misconception that still exists as to the
origin of the conception. Now the individual is no conception, but the mere
subjective comprehension of an actual object, presented to us under some
given specific conception, and on this latter it alone depends whether the
object is or is not an individual. Under the specific conception of the
solar system, ours is an individual: in relation to the specific conception
of a planetary body, it is an aggregate of many individuals." ... "I think,
however, that looking at the indubitable facts already mentioned, and the
relations treated of in the course of these considerations, it will appear
most advantageous and most useful, in a scientific point of view, to
consider the vegetable cell as the general type of the plant (simple plant
of the first order). Under this conception, _Protococcus_ and other plants
consisting of only one cell, and the spore and pollen-granule, will appear
as individuals. Such individuals may, however, again, with a partial
renunciation of their individual independence, combine under definite laws
into definite forms (somewhat as the individual animals do in the globe of
the _Volvox globator_[25]). These again appear empirically as individual
beings, under a conception of a species (simple plants of the second order)
derived from the form of the normal connexion of the elementary
individuals. But we cannot stop here, since Nature herself combines these
individuals, under a definite form, into larger associations, whence we
draw the third conception of the plant, from a connexion, as it were, of
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