xxxii CONTENTS. 



PAGE 



500. The probable progressive development of visual sensations ; lower 



and higher visual centres . 793 



501. Sensations of smell. The cortical area for smell .... 794 



502. Sensations of taste . . 795 



503. Sensations of hearing 796 



SECTION V. 

 ON THE DEVELOPMENT OF CUTANEOUS AND SOME OTHER SENSATIONS. 



504. Sensations of touch, heat, cold, and pain 798 



505. Theoretical difficulties touching the cortical localisation of cutaneous 

 sensations. The effects on cutaneous sensations of removing 

 regions of the cortex 799 



506. The afferent tracts from the spinal cord, their endings in the brain . 800 



507. The effect of sections of the spinal cord on the transmission of 

 afferent impulses influencing the vasomotor centre. Other 

 experiments on animals as to the effects of sections of the 

 spinal cord on the transmission of sensory impulses . '. . 802 



508. The teachings of clinical histories ; different paths for different 



sensory impulses 804 



509. General considerations on the development of sensations along the 

 spinal cord. The cerebellar tract, the median posterior tract, 

 the grey matter and internuncial tracts . ; f . ' . . 805 



510. The terms ' sensory ' and ' motor ' not an adequate description of 



the processes in the central nervous system . ... 808 



511. The transmission of sensations within the brain. The relations of 



the cerebellum . 810 



SECTION VI. 

 ON SOME OTHER ASPECTS OF THE FUNCTIONS OF THE BRAIN. 



512. Considerations touching the cerebellum 812 



513. Considerations touching the corpora quadrigemina .... 814 



514. The splanchnic functions of the brain 816 



SECTION VII. 

 ON THE TIME TAKEN UP BY CEREBRAL OPERATIONS. 



515. The reaction period or reaction time 819 



516. Elementary analysis of psychical processes, the time taken up by 



each. The time required for discrimination, for the develop- 

 ment of perception, and of the will ; the circumstances influenc- 

 ing them 821 



