Abstract

Putnam and others have argued that semantic externalism extends to artifactual kind words such as “pencil” or “doorstop”. I first show that, even with natural kinds, externalism applies to words for ground level kinds. The issue then arises of which categories of artifacts should be identified as kinds in the relevant, restricted sense. I argue that, though there are natural taxonomies of artifactual categories at least some of which have well-defined ground levels, even words for such kinds do not appear to have externalist semantics, as they do not support ignorance or error arguments. Some think that membership to any kind is determined by objective features. Against this, I argue that the makers’ productive intentions are often crucial in selecting which pattern of features counts as constitutive of a kind. Though externalists may insist that membership to a kind is ultimately determined by sharing objective features, the resulting version of externalism can hardly be distinguished from internalism.