- 1The basic idea of affinity as overall similarity, which is logically and historically prior to that of evolutionary affinity, is described. It is in constant use in taxonomy
- 2After an analysis of the ideas of different forms, the general plan of construction of an organism, similarity in general plan, and the single character, a procedure is worked out which makes precise the judgment of affinity, and enables us to obtain a numerical value for the mean character difference between any two forms
- 3As a result, it is shown that the family tree diagram can be used only for the evolutionary topology of a group, not for showing amount of evolutionary difference
- 4A measure of the relevance of a taxonomic comparison is described
- 5The possibility of giving a quantitative basis to the taxonomic hierarchy is pointed out
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