. The causes and course of organic evolution; . ergy expended. Such being necessarily true, it follows physically that eithervery large supplies of the more simple organic food compounds,or moderate supj^lies of some highly complex organic body,should be stored in or around the ganglion cells, and shouldgradually be used up during mental acts. After prolongedand intense mental activity, therefore, such a material wouldreach its lowest ebb. Now in rested ganglion cells an abundantreserve of fine aggregated granules—the Nissl bodies or neuratinas we have named such—either crowd the cell substanc
. The causes and course of organic evolution; . ergy expended. Such being necessarily true, it follows physically that eithervery large supplies of the more simple organic food compounds,or moderate supj^lies of some highly complex organic body,should be stored in or around the ganglion cells, and shouldgradually be used up during mental acts. After prolongedand intense mental activity, therefore, such a material wouldreach its lowest ebb. Now in rested ganglion cells an abundantreserve of fine aggregated granules—the Nissl bodies or neuratinas we have named such—either crowd the cell substance ir-regularly as amongst many invertebrates cited, or are arrangedin concentric layers or in patterns as seems frequently true ofvertebrate nerve-cells. The granules become more cloudy, CoGiTic Evolution of Man 603 break down, and largely disappear during mental activity andresulting fatigue. After rest and repair of the tissues, thegranules gradually increase in quantity and sharpness (p. 235).Illustrations of such cells are given
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