of. LOMMEL (University of Erlangen), _Optics._ (In press.)

Rev. M. J. BERKELEY, M.A., F.L.S., and M. COOKE, M.A., LL. D.,
_Fungi; their Nature, Influences, and Uses._ (In press.)

Prof. W. KINGDON CLIFFORD, M.A., _The First Principles of the Exact
Sciences explained to the non-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 ODLONG, F.R.S., _The Old Chemistry viewed from the New
Standpoint._

W. LAUDER LINDSAY, M.D., F.R.S.E., _Mind in the Lower Animals._

Sir JOHN LUBBOCK, Bart, F.R.S., _The Antiquity of Man._

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._

Prof. W. STANLEY JEVONS, _Money: and the Mechanism of Exchange._

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, _Physical and Metaphysical Phenomena of
life._

Prof. H. SAINTE-CLAIRE DEVILLE, _An Introduction to General
Chemistry._

Prof. WURTZ, _Atoms and the Atomic Theory._

Prof. DE QUATREFAGES, _The Negro Races._

Prof. LACAZE-DUTHIERS, _Zoology since Cuvier._

Prof. BERTHELOT, _Chemical Synthesis._

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 Relation
to the Bodily Functions._

Prof. W. D. WHITNEY, _Modern Linguistic Science._

Prof. C. A. YOUNG, Ph. D. (of Dartmouth College), _The Sun._

Prof. BERNSTEIN (University of Halle), _Physiology of the Senses._

Prof. FERDINAND COHN (Breslau University), _Thallophytes (Algaee,
Lichens, Fungi)._

Prof. HERMANN (University of Zurich), _Respiration._

Prof. LEUCKART (University of Leipsic), _Outlines of Animal
Organization._

Prof. LIEBREICH (University of Berlin), _Outl