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                                            GIBBS, JOSIAH WILLARD.  Elements of Vector Analysis.  New Haven, 1881-4.  PRESENTATION COPY, inscribed "from the author" on front wrapper--On the Equilibrium of Heterogeneous Substances.  Abstract by the author.  Offprint from: The American Journal of Science and Arts, Vol XVI, Dec., 1878--Equilibrium of Heterogeneous Substances.  Offprint from: Transactions of the Connecticut Academy of Arts and Sciences. Vol III, Part 1, pages 108-248 and Part 2, pages 343-524.  New Haven, 1874-78--On the Vapor-Densities of Peroxide of Nitrogen, Formic Acid, Acetic Acid, and Perchloride of Phosphorus.  Offprint from: The American Journal of Science and Arts. Vol. XVIII, 1879.  Together, 4 papers bound in one, 8vo, buckram; 3 front wrappers bound in.