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 (Algæe, 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.