as necessary for thought as stomach for digestion, ii. 237;
the regulator of the will, ii. 470;
the condition of self-consciousness, iii. [12] seq.;
influence of its development upon intellect at different periods of life, ii. 425, 454 seq.;
necessity of sleep for, ii. 464;
effect of over-work on, ii. 255, 256;
its variation in man the cause of individual character, i. 171;
its activity in dreams, ii. 464;
the brain of genius, iii. [159], [160];
influence on agility of limbs, iii. [21];