Book digitized by Google from the library of Harvard University and uploaded to the Internet Archive by user tpb. Preface signed by editor: C. S. Peirce The logic of the Epicureans / Allan Marquand -- A machine for producing syllogistic variations / Allan Marquand -- Note on an eight-term logical machine -- On the algebra of logic / Christine Ladd -- On a new algebra of logic / O.H. Mitchell -- Operations in relative number with applications to the theory of probabilities / B.I. Gilman -- A theory of probable inference / C.S. Peirce