. The causes and course of organic evolution; . c ^Mi^ Fig. 28.—a, ganglion cell from Crayfish (after Pfliicke) showing numerousfine neuratin granules intimately associated with the nerve fibrils; h, stainedganglion cell from infant (after Ewing) showing large dark neiuatin granules;c, stained ganglion cell of Rabbit with neuratin granules as in h. Here is definitely suggested, then, a substance that becomesused up as mental energy is expended, and that gradually ac-cumulates again as this energy is recuperated. In all prob-ability this energy, that we have called cogitic, is itself derivedfro
. The causes and course of organic evolution; . c ^Mi^ Fig. 28.—a, ganglion cell from Crayfish (after Pfliicke) showing numerousfine neuratin granules intimately associated with the nerve fibrils; h, stainedganglion cell from infant (after Ewing) showing large dark neiuatin granules;c, stained ganglion cell of Rabbit with neuratin granules as in h. Here is definitely suggested, then, a substance that becomesused up as mental energy is expended, and that gradually ac-cumulates again as this energy is recuperated. In all prob-ability this energy, that we have called cogitic, is itself derivedfrom, and is a greatly more condensed exhibition than is, thecognitic, that seems to energize and traverse the chromatinsubstance. For it is noticed that, during activity and exhaus-tion of the ganglion cells, the chromatin of the nucleus, andspecially of the nucleolus, becomes reduced at the same timethat the neuratin becomes first l)roken up and then largely ab-sorbed. When rest ensues the nucleolar chromatin, as well asthe neuratin, accunuil
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