 Philosophers may well study the stock use of various expressions. But these may be highly technical or semi-technical expressions, as well as vernacular ones. Berkeley, for example, in examining the stock (and possibly the only) use of ‘infinitesimals’, was examining the way in which this word was employed by mathematicians. Philosophers of law, biology, mathematics, formal logic, theology, psychological and grammar are all required to examine technical terms or concepts. So if ‘ordinary’ is contrasted with ‘technical’ or ‘specialised’ then some philosophy is and some philosophy is not concerned with ordinary language (1953, 304).