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We will attempt to briefly summarize this charmingly written book. The law of the correlation of forces makes it evident that the functional activity of the brain is dependent upon the liberation of force by the decomposition of the organic matter supplied to that organ. Hence interference with this decomposition through the direct diminution of the supply as in compression of the carotids, or indirectly, either through failure of the organs of alimentation or from deviation into other channels, as in great muscular development, or through diminished functional activity of the brain tissue such as results from mental overwork, will lead to a diminution of its power. This latter condition, to which those previously mentioned may be accessory, constitutes brain exhaustion.
It is also shown that the rational hygiene of the emotions is important to the health of the individual, and that the power of memory serves as an index
C. E. W. . Brain Exhaustion, with some Preliminary Consideration on Cerebral Dynamics.. JAMA. 1884;III(23):644. doi:10.1001/jama.1884.02390720028013