Preface. Introduction: Natural Kinds and Other Assorted Concepts; P.J. Riggs. On the Necessity of Natural Kinds; J. Collier. Natural Kinds and Natural Kind Reasoning; B. Ellis. The Jerrybuilt House of Humeanism; C. Lierse. Physical Necessity and the Passage of Time; P. Forrest. Theorizing and Empirical Belief; F.J. Clendinnen. Indifference and Induction; L. O'Neill. Towards Metamethodology: For the History and Philosophy of Science; J. Fox. Elk Theories: A Galilean Strategy for Validating a New Scientific Discovery; N. Thomason. Of Crows and Quarks: Reflections on the Laws of Quantum Mechanics; A. Heathcote. Laws and States in Quantum Mechanics; J. Forge. Instrumental Theories: Possibilities and Space and Time; I. Hinckfuss. Spacetime or Quantum Particles: The Ontology of Quantum Gravity? P.J. Riggs. Comments on Lierse; D.M. Armstrong. Comments on Forge; A. Heathcote. Comments on Thomason; K. Hutchison. Index.