 Reichenbach entertained non-standard logics as early as 1925 in the form of “probability logic.” In the Theory of Probability, probability logic amounts to no more than the assignment of probability values to formulas in the propositional calculus. Later, a three-valued logic was introduced for quantum theory, as discussed above. Reichenbach’s major effort in logic, however, is in Elements of Symbolic Logic, published in 1947, but begun as lecture notes for courses during Reichenbach’s Turkish years. The book is notable chiefly for the extended and detailed effort to formalize universal logical structures of conversational languages within the limits of first order logic and type theory. Reichenbach’s knowledge of German, English, French, and especially, Turkish, helped to make his proposals linguistically serious, and the result, a detailed, and in some respects quite original, logical grammar, including accounts of adverbial modification, tense and modality, is substantially richer than related logical efforts of his contemporaries. Other topics of interest, such as vagueness, are not discussed—Reichenbach perhaps considered vagueness a mistake rather than a topic for logical analysis. 