Yet it might be that some ancient languages had altered very
little and had given rise to few new languages, whilst others had altered
much owing to the spreading, isolation and state of civilisation of the
several co-descended races, and had thus given rise to many new dialects
and languages. The various degrees of difference between the languages of
the same stock would have to be expressed by groups subordinate to groups;
but the proper or even the only possible arrangement would still be
genealogical; and this would be strictly natural, as it would connect
together all languages, extinct and recent, by the closest affinities, and
would give the filiation and origin of each tongue.
In confirmation of this view, let us glance at the classification of
varieties, which are known or believed to be descended from a single
species. These are grouped under the species, with the subvarieties under
the varieties; and in some cases, as with the domestic pigeon, with several
other grades of difference. Nearly the same rules are followed as in
classifying species. Authors have insisted on the necessity of arranging
varieties on a natural instead of an artificial system; we are cautioned,
for instance, not to class two varieties of the pine-apple together, merely
because their fruit, though the most important part, happens to be nearly
identical; no one puts the Swedish and common turnip together, though the
esculent and thickened stems are so similar.
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