A set of interconnected chapters on topics in the theory of knowledge. Part 1 considers the concept of knowledge, its logical properties, and its relation to belief and partial belief, or credence. It includes a discussion of belief revision, two discussions of reflection principles, a chapter about the status of self-locating knowledge and belief, a chapter about the evaluation of normative principles of inductive reasoning, and a development and defense of a contextualist account of knowledge. Part 2 is concerned with conditional propositions, and conditional reasoning, with chapters on the logic and formal semantics of conditionals, a discussion of the relation between indicative and subjunctive conditionals and of the question whether indicative conditionals express propositions, a chapter considering the relation between counterfactual propositions and objective chance, a critique of an attempt to give a metaphysical reduction of counterfactual propositions to nonconditional matters of fact, and a discussion of dispositional properties, and of a dispositional theory of chance.