This is the second volume of analytical commentary on Wittgenstein's masterpiece, the "Philosophical Investigations". Like the first, it consists of philosophical essays and critical exegesis. The six essays deal comprehensively with various themes in Wittgenstein's philosophy: the relationship between his mathematics and his philosophy of mind; his conception of grammar and rules of grammar; the relation between a rule and what accords with a rule; the characterization of rule-following as mastery of a technique manifest in practice; his notion of a form of life, and of agreement in definitions and judgements; a comprehensive investigation into his account of logical and mathematical necessity and other topics.