Living organisms are immensely complicated things, most of which (except the minutest) present at a glance a vast variety of structural and other characters that can be considered from many aspects. The analogy between animals and writings would seem to be clear, and the necessity for co‐ordinate classification equally great for both. Certainly, many different sorts of classification are used for animals and their parts, in relation to their genetics, development, functions in the widest sense, distribution, ecology, and evolution. Yet there is one principal classification which bears the principal reference system, and co‐ordinate classification is only subsidiary.
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