374 



INDEX OF SUBJECTS. 



ganglia, 169 ; structure, 144 ; 

 time of enlargement, 150, 163, 

 transformations, 149 ; ventral 

 roots of frog, 166, 167 ; 

 volume, 152 ; volume at 

 various ages, 156, 160 

 Nerve impulse, 278 ; roused at 

 end of branches, 278 ; con- 

 duction, 231 ; continuity of 

 stimulation, 283, 284 ; direc- 

 tion, 278, 280 ; form, 282 ; 

 nature, 278 ; pathway, 227- 

 228 ; responses, 268 



OLD age : anatomy, 324 ; brain, 

 324-327 ; cortex, 328 ; de- 

 crease in working power, 332, 

 333 ; nerve cells, 328-330 



Organisation, errors in, 348 



RACE differences, 349 



Rhythms, annual, 296 ; causes, 

 297 ; daily, 296, 297 ; minor, 

 303, 304 ; monthly, 296 ; in 

 muscular work, 299, 301 ; in 



race development, 295 ; in 

 reaction time, 301, 302 ; in 

 stature, 299 ; of stimuli, 294 ; 

 temperature, 298, 299 ; weekly, 

 296 ; in weight, 299 



SENSE discrimination, 344-345 



Sense images, 348, 349 



Sleep, 3 13-31 6 



Spinal cord, 108, 109 1~\ O 



Soma, 295 



Stature, 79 ; influence of illness, 



58; rate of increase, 81 

 Structural elements, size of, 351, 



352 



VARIABILITY, 304, 305 

 Vigour and capacity, 362, 363 

 Viscera, weight changes of, 72 ; 



observations from the dead, 



75 



WEIGHT : basal ganglia, 101 ; 



viscera, 68. (See Brain.) 

 White matter, 92 



