ABSTRACT
Other things being equal, the greatest amount of mental capacity and vigour is allied with the largest quantum of cerebral substance. All observation, as regards men and animals, proves that the energy of any nervous centre always bears a direct proportion to its bulk, whether absolute or relative . Every organ of our body increases in size, in pro portion to its exercise, within the limits of its physiological capacity, and this holds good with regard to the brain. With increased mental work, the brain will show an increased growth.
