Under these circumstances it may well be asked, how is one mass of
non-nucleated protoplasm to be distinguished from another? why call one
"plant" and the other "animal"?
The only reply is that, so far as form is concerned, plants and animals
are not separable, and that, in many cases, it is a mere matter of
convention whether we call a given organism an animal or a plant. There
is a living body called _Aethalium septicum_, which appears upon
decaying vegetable substances, and, in one of its forms, is common upon
the surfaces of tan-pits. In this condition it is, to all intents and
purposes, a fungus, and formerly was always regarded as such; but the
remarkable investigations of De Bary have shown that, in another
condition, the _Aethalium_ is an actively locomotive creature, and takes
in solid matters, upon which, apparently, it feeds, thus exhibiting the
most characteristic feature of animality. Is this a plant; or is it an
animal? Is it both; or is it neither? Some decide in favour of the last
supposition, and establish an intermediate kingdom, a sort of biological
No Man's Land for all these questionable forms.
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