xii CONTENTS. 



SECTION VII. 

 ON VOLUNTARY MOVEMENTS. 



PAGE 



653. The real distinction between voluntary and involuntary movements . 1034 

 654. The cortical motor areas of the dog ; the characters of the move- 

 ments resulting from cortical stimulation 1035 



655. The cortical motor areas in the monkey 1038 



656. The cortical motor areas in the anthropoid ape .... 1043 

 657. The movements of cortical origin carried out by means of the 



pyramidal tract ; the nature of the movements so carried out . 1044 

 658. The results of the removal of a cortical area in dog and in the 



monkey 1049 



659. The cortical motor areas in man ; the area for speech . . . 1052 

 660. The nature of the action of a motor area in carrying out a voluntary 



movement ; the characters of aphasia 1056 



661. The same as illustrated by the area for a limb in the dog; the 



influence of sensory impulses 1058 



662. The relations of the motor area to other parts of the central nervous 

 system; the motor area employed in movements usually called 



involuntary 1061 



663. The passage of volitional impulses along the spinal cord in animals . 1063 



664. Their passage in man 1065 



A summary of the chief facts concerning the carrying out of 

 voluntary movements 1066 



SECTION VIII. 



ON THE DEVELOPMENT WITHIN THE CENTRAL NERVOUS SYSTEM OF 

 VISUAL AND OF SOME OTHER SENSATIONS. 



Visual impulses and sensations ; visual fields, and binocular vision . 1070 

 667. The decussation of the optic nerves in the optic chiasma . . 1073 



668. The course of the optic tract 1074 



669. The endings of the optic tract in the lateral corpus geniculatum, the 

 pulvinar and the anterior corpus quadrigeminum ; the results of 



degeneration and atrophy experiments 1075 



670. The connection of the three above bodies with the cerebral cortex ; 

 the meaning of the terms, blindness total and complete or partial, 

 hemianopsia, amblyopia. The difficulties of interpretation attend- 

 ing experiments on the vision of animals 1076 



671. The nature of the movements of the eyes caused by stimulation of 



the occipital cortex 1079 



672. The effects on vision of removing parts of the occipital cortex in 



monkeys and in dogs; the teachings of clinical histories . . 1081 

 673. The probable progressive development of visual sensations ; lower 



and higher visual centres 1083 



674. Sensations of smell. The structure of the olfactory bulb and tract ; 



the connections of the tract with other parts of the cerebrum . 1085 



