Nature and design of this work, Signs and their laws, Derivation of the laws, Division of propositions, Principles of symbolical reasoning, Of Interpretation, Of Elimination, Of Reduction, Methods of Abbreviation, Conditions of a perfect method, Of secondary propositions, Methods in secondary propositions, Clarke and spinoza, Example of analysis, Of the aristotelian logic, Of the theory of probabilities, General method in probabilities, Elementary illustrations, Of statistical conditions, Problems on causes, Probability of Judgements, Constitution of the intellect