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 790 



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 805 



§ 510. The terms 'sensory 1 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 



