A new and interesting feature of the fourth annual session of the seminar was the reports on experimental psychology of animals by Dr. Thorndike, who reported the results o f his experiments with fishes, and by Mr. Yerkes, who reported on similar work with turtles. Both of these researches were undertaken to determine the associative power of animals and the investigation is to be extended to all the groups suitable for this method of study. Dr. Locy reported the results obtained in his

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... ry by Dr. Chas. Hill in the study of the nietamerism of the head of living chick and trout embryos. The great care with which the work was done and the careful study of consecutive stages and repeated verification of the work were considered by Dr. Locy as important, as the conclusions strongly supported his own work. Dr. Metcalf reported on that part of his work on the Tunicata bearing on the relation of the neural ganglion and the neural gland, in development. The evidence obtained tended to support the position that they arose from a common rudiment. Dr. Lefevre described the origin of the neural ganglion in budding Perophora and Mr. Hunter gave a demonstratiop of the ganglion cells in the neural gland of the adult Molgula, by means of methylene blue. Dr. Lee summarized the evidence opposed to the existence of the sense of hearing in Fishes. Dr. Lyon gave some very interesting demonstrations of the compensatory movements of insects and some of the vertebrates. Mr. Prentiss described the development and adult structure of the auditory, olfactory and tactile hairs of Palemonetes and the innervation of the otocyst. The preparations of the otocyst demonstrated in the clearest manner the relation of the nerves to the sensory cells of the otocyst and to the brain. The gold chloride preparations of the nerves of the earthworm by Professor Fling showed the relations of the main nerves of a segment to each other and to the nerves of the adjoining segments.