|Species: groups of individuals based on common characteristics. See also biological species, natural kinds.|
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Natural kind/Wright: it must be possible that this conjunction, which was established a priori when it is established at all, had been not made in fact: e.g. it may be that indeed there simply is no interesting physical matter as a basis for the manifestations that have a prominent similarity for us.
E.g. when we assume that the term gold stands for a natural kind (WrightVs), then we have to admit that science could find out that there is nothing like gold at all.
Wahrheit und Objektivität Frankfurt 2001