9.6 Inventory and Additivity Analyses Using Complex, Single-Operation Arguments -- 9.7 Conclusions of Experiment 2 -- 10. Experiments 3: New Operations -- 10.1 Aims of the Experiment -- 10.2 Method -- 10.3 Preliminary Analyses of Results -- 10.4 Inventory and Additivity Analyses -- 10.5 Conclusions of Experiment 3 -- 11. Experiment 4: Amalgamation of the Two Sets of Operations -- 11.1 Aims of the Experiment -- 11.2 Method -- 11.3 Preliminary Analyses of Results -- 11.4 Inventory and Additivity Analyses -- 11.5 Conclusions of Experiment 4 -- 12. Experiment 5: Further Test of the Theory -- 12.1 Aims of the Experiment -- 12.2 Method -- 12.3 Preliminary Analysis of Results -- 12.4 Inventory and Additivity Analyses -- 12.5 Conclusions of Experiment 5 -- PART III: FAMILIAR CONTENT AND CLASS INCLUSION -- 13. The Question of a Qualitative Difference Reexamined -- 13.1 Essential and Nonessential Differences -- 13.2 The Problem of Content in Reasoning -- 13.3 Class Inclusion and the Problem of Logical Generality -- 14. Experiment 6: Causal Arguments Testing the Theory of Table 8.1 -- 14.1 Aims of tlie Experiment -- 14.2 Method -- 14.3 Preliminary Analyses of Results -- 14.4 Inventory and Additivity Analyses -- 14.5 Conclusions of Experiment 6 -- 15. Experiment 7: Causal Arguments Testing the Theory of Table 11.1 -- 15.1 Aims of the Experiment -- 15.2 Method -- 15.3 Preliminary Analyses of Results -- 15.4 Inventory and Additivity Analyses -- 15.5 Conclusions of Experiment 7 -- 16. Experiment 8: More Causal Arguments Testing the Theory of Table 11.1 -- 16.1 Aims of the Experiment -- 16.2 Method -- 16.3 Preliminary Analyses of Results -- 16.4 Inventory and Additivity Analyses -- 16.5 Conclusions of Experiment 8 -- 17. Experiment 9: Class-Inclusion Arguments Testing the Theory of Table 8.1 -- 17.1 Aims of the Experiment -- 17.2 Method