The British Journal of Psychology

Edited by JAMES WARD and W. H. R. RIVERS.

With the Collaboration of A. KIRSCHMANN, W. MCDOUGALL, C. S. MYERS, A. F. SHAND, C. S. SHERRINGTON, W. G. SMITH.

NOW READY. Vol. I. Part 3. January, 1905. Price 5s, net.

CONTENTS,

SMITH, NORMAN. Malebranche's Theory of the Percep-
tion of Distance and Magnitude. (One Figure).
HALES, F. N. Materials for the Psycho-genetic Theory of
Comparison.

SMITH, W. G. A Comparison of some Mental and Physical
Tests in their application to Epileptic and to
Normal Subjects. (One Figure).

CALKINS, MARY WHITON. The limits of Genetic and of
Comparative Psychology.

SPEARMAN, C. Analysis of Localisation,' illustrated by a
Brown-Séquard case. (Eleven Diagrams).

The Journal will be issued in parts at irregular intervals. Four parts will (usually) constitute a volume of about 450 pages Royal 8vo. The price to subscribers, payable in advance, will be 15s. net per volume (post free). The price of single numbers will depend on the size of each number.

Subscribers may send their names to any Bookseller or to the Cambridge University Press Warehouse, Ave Maria Lane, London, E. C.

Papers for publication should be sent to Professor WARD, 6, Selwyn Gardens, Cambridge, or to Dr. W. H. R. RIVERS, St. John's College, Cambridge.

London: Cambridge University Press Warehouse, Ave Maria Lane.

C. F. CLAY, Manager.

CONTENTS.

The Sense of Hearing in Frogs. By ROBERT M. YERKES. (From the Harvard Psychological Laboratory.) With

seven figures in the text.

The Reactions of Ranatra to Light. By S. J. HOLMES. (From the Zoological Laboratory of the University of Michigan.) With six figures in the text.

Literary Notices.

279

305 350

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, O.

Published bi-monthly

DENISON UNIVERSITY, GRANVILLE, OHIO

Neurology and Psychology.

PUBLISHER'S ANNOUNCEMENT.

Back numbers of most issues of this Journal may be had separately at the rate of $3.50 per volume for the first thirteen volumes and $4.00 per volume for subsequent issues, postage extra. A few of the numbers, however, will be sold only in complete sets. Single copies of current issues 75c.

CONTENTS OF RECENT NUMBERS.

Volume XV, Number 4, July, 1905.

Seven figures.

The Sense of Hearing in Frogs. By ROBERT M. YERKES.
The Reactions of Ranatra to Light. By S. J. HOLMES. Six figures.
Literary Notices.

Volume XV, Number 3, May, 1905.

The Morphology of the Vertebrate Head from the Viewpoint of the Functional Divisions of the Nervous System. By J. B. JOHNSTON. Four plates.

Volume XV, Number 2, March, 1905.

Observations on the Spinal Cord of the Emu and its Segmentation. By IRVING HARDESTY. Four figures.

The Selection of Random Movements as a Factor in Phototaxis. By S. J. HOLMES.

Notes on the Development of the Sympathetic Nervous System in the Common Toad. By WALTER C. JONES, M. D. Twelve Figures.

Editorial: Concerning the Genetic Relations of Types of Action.-The Basis for Taxis and Certain Other Terms in the Behavior of Infusoria.-The Problem of Instinct.

A Review of Some Recent Literature on the Chemistry of the Central Nervous System. By ISADOR H. CORIAT.

Literary Notices.

Volume XV, Number 1, January, 1905.

On the Areas of the Axis Cylinder and Medullary Sheath as seen in Cross Sections of the Spinal Nerves of Vertebrates. By HENRY H. DONALDSON and G. W. HOKE. One figure.

On the Number and Relations of the Ganglion Cells and Medullated Nerve Fibers in the Spinal Nerves of Frogs of Different Ages. By IRVING HARDESTY. Editorial: Psychology and Neurology.-The International Commission on Brain Research.

Literary Notices.

By WILHELM LOESER, M.D.

(From the Physiological Laboratory of the University of Kansas.)

As a contribution to the study of the comparative physiology of the brain, it seemed important to undertake a more detailed investigation of the functions of the different parts of the frog's brain than had hitherto been made.

The work done by me under the supervision of Dr. IDA H. HYDE to whom I am under great obligations-can, at best, constitute only a small link, in the long and complex chain of comparative physiology. The experiments extended over a period of two and a half months, and the material operated on consisted of more than fifty frogs of the species Rana temporaria.

I employed GOLTZ's method, i, e., that of excising various parts, or aggregations of parts, of the central nervous sys. tem, and observed the resulting phenomena, particularly the deficiency phenomena. Both uni- and bilaterial excisions were resorted to. The animals were anesthetized with ether until they would not readily turn over on the ventrum when put on the dorsum, but would respond only with convulsive jerks of the muscles of the limbs. For operations on the medulla the anesthesia was carried further to prevent movements during the operation After the frog had reached this stage of anæsthesia, it was tied with its ventrum upon the frog board. sponge moistened with ether and placed in front of the nares was sufficient to keep the animal in the desired stage of anesthesia

A