 The transition from the natural language of action to the artificial language of action and from this latter to the language of articulate sounds is recapitulated in an amplified form in the general movement of arts and civilization away from primitive forms of languages that are more expressive of emotions towards forms of language that are more descriptive. All historical languages can be considered as “analytic methods,” since their grammar, prosody, and vocabulary reflect a certain stage in the development of analysis. However, in the formation of historical languages various contingencies such as the climate and the temper of people played a role. Historical languages contain many errors made in the analysis of facts and these errors are passed on from generation to generation (Grammar I.1-8, Logic II.3-4). Science should strive to be based on a “well-formed language.” Late in his life, Condillac took algebra to be the best model of such a well-formed language (Logic II.5). In algebra we show clearly and by a limited number of steps how to find certain unknown quantities given certain known quantities. Condillac took himself to have done something similar for philosophy. What is initially known is sensation. Condillac took himself to have shown in his work the genesis of all mental life from this primitive element (Logic II.7-8).