CONTENTS. A Study of the Functions of Different Parts of the Frog's (From the Physio The Central Gustatory Paths in the Brains of Bony Fishes. By C. JUDSON HERRICK. (Studies from the Neurological Laboratory of Denison University. No. XVIII.) Literary Notices. 375 457 THE JOURNAL OF COMPARATIVE NEUROLOGY AND PSYCHOLOGY is published bi-monthly. The annual volume of six numbers comprises about 500 pages, with plates and text-figures. The subscription price is $4.00 a year, strictly net (foreign subscription, $4.30, 18 s., M. 18, 22 fr., L. 22), postage prepaid. Authors receive 50 reprints of their papers gratis and additional copies are supplied at cost. All MSS. and matter for review relating to the Structure of the Nervous System and all business correspondence should be addressed to the MANAGING EDITOR AT DENISON UNIVERSITY, GRANVILLE, OHIO. Editorial Matter relating to Comparative Psychology and the Physiology of the Nervous System should be sent directly to DR. ROBERT M. YERKES, PSYCHOLOGICAL LABORATORY, HARVARD UNIVERSITY, CAMBRIDGE, MASS. Entered as second-class matter in the Postoffice at Granville, Q. J. MARK BALDWIN, Johns Hopkins University 8. I. FRANZ, McLean Hospital, Waverley, Mass. S. J. HOLMES, University of Michigan B. F. KINGSBURY, Cornell University C. LLOYD MORGAN, University College, Bristol Published bi-monthly DENISON UNIVERSITY, GRANVILLE, OHIO (From the Anatomical Laboratory, St. Louis University.) With Plate V. A superficial study of the optic vesicles as they develop in Necturus showed certain interesting features, which have not been heretofore described. On account of the large size of its cellular elements, the cytological changes in this animal admit of a more exact interpretation than is afforded by other vertebrates. The formation of the neural plate in Necturus is initiated by certain changes in the ectodermal cells, which elongate from the low cuboidal of the superficial ectoderm to the long columThe same changes nar type, as shown in Fig. 1, e.c and n.c. are shown under higher magnification in Figs. 7 and 8, Fig. 7 representing a cell near the center of the neural plate, and Fig. 8 an ectodermal cell beyond the margin of the neural plate. The cells of which Fig. 7 is a type are divisible into two parts, a proximal and a distal. The former is full of yolk granules and usually contains the nucleus. This nucleus varies in shape from round to long oval, its long diameter being from two to three times the short. Sometimes it is irregular in shape, in which case it is usually found near the center of the neural plate. When the nucleus lies in the distal part of the cell, it is frequently observed undergoing mitosis. |