Prof. W. Kingdon Clifford, M. A. The First Principles of the Exact Sciences explained to the N~on-mathematical.

Prof. T. H. Huxley, LL. D., F. R. S. Bodily Motion and Consciousness.

Dr. W. B. Carpenter, LL. D., F. R. S. The Physical Geography of the Sea.

Prof. William Odling, F. R. S. The Old Chemistry viewed from the New Stand-point.

W. Lauder Lindsay, M. D., F. R. S. E. Mind in the Lower Animals. Sir John Lubbock, Bart, F. R. S. On Ants and Bees.

Prof. W. T. Thiselton Dyer, B. A., B. Sc. Form and Habit in Flowering Plants.

Mr. J. N. Lockyer, F. R. S. Spectrum Analysis.

Prof. Michael Foster, M. D. Protoplasm and the Cell Theory.

H. Charlton Bastian, M. D., F. R. S. The Brain as an Organ of Mind.

Prof. A. C. Ramsay, LL. D., F. R. S. Earth Sculpture: Hills, Valleys, Mountains, Plains, Rivers, Lakes; How they were Produced, and how they have been Destroyed.

Prof. Rudolph Virchow (Berlin University). Morbid Physiological Action. Prof. Claude Bernard. History of the Theories of Life.

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Prof. H. Sainte-Claire Deville. An Introduction to General Chemistry,

Prof. Wurtz. A toms and the A tomic Theory.

Prof. De Quatrefages. The Human Race.

Prof Lacaze-Duthiers. Zoology since Cuvier.

Prof. Berthelot. Chemical Synthesis.

Prof. C. A. Young, Ph. D. (of Dartmouth College). The Sun.

Prof. Ogden N. Rood (Columbia College, N. Y.). Modern Chromatics and its Relations to A rt and Industry.

Dr. Eugene Lommel (University of Erlangen). The Nature of Light. Prof. J. Rosenthal. General Physiology of Muscles and Nerves. Prof. James D. Dana, M. A., LL. D. On Cephalization; or, Head-characters in the Gradation and Progress of Life.

Prof. S. W. Johnson, M. A. On the Nutrition of Plants.

Prof. Austin Flint, Jr., M. D. The Nervous System, and its Reaction to the Bodily Functions.

Prof. Bernstein (University of Halle). The Five Senses of Man. Prof. Ferdinand Cohn (Breslau University). Thallophytes (Alga,, Lichens Fungi).

Prof. Hermann (University of Zurich). Respiration.

Prof. Leuckart (University of Leipsic). Outlines of Animal Organization.

Prof. Liebreich (University of Berlin). Outlines of Toxicology.

Prof. Kundt (University of Strasburg). On Sound.

Prof. Rees (University of Erlangen). On Parasitic Plants.

Prof. Steinthal (University of Berlin). Outlines of the Science of Language.

P. Bert (Professor of Physiology, Paris). Forms of Life and other Cosmical Con ditions.

E. Algl.A VE (Professor of Constitutional and Administrative Law at Douai, and of Political Economy at Lille). The Primitive Elements of Political Constitutions.

P. Lorain (Professor of Medicine, Paris). Modern Epidemics.

Prof. Schutzenberger (Director of the Chemical Laboratory at the Sor bonne). On Fermentations.

Mons. Freidel. The Functions of Organic Chemistry.

Mons. Debray. Precious Metals.

Prof. Corfield, M. A., M. D. (Oxon.). Air in its Relation to Health,

Prof. A. Giard. General Embryology.

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