. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . the pigment is other-wise unknown. § 9. The arrangement of cells,dendrites, and terminations ofaxons in the gray matter is ofno less importance than thestructure of the single cell. Ingeneral, it may be said that theinterweaving of branches fromdifferent cells is very dense andintricate. The number of cellsis great, even in a small ganglionor nucleus; the number of axonsentering and terminating is also great; and the relations of theaxons to the cells
. Elements of physiological psychology; a treatise of the activities and nature of the mind, from the physical and experimental points of view . the pigment is other-wise unknown. § 9. The arrangement of cells,dendrites, and terminations ofaxons in the gray matter is ofno less importance than thestructure of the single cell. Ingeneral, it may be said that theinterweaving of branches fromdifferent cells is very dense andintricate. The number of cellsis great, even in a small ganglionor nucleus; the number of axonsentering and terminating is also great; and the relations of theaxons to the cells near which they terminate is not by any meanseasy to make out. It is fairly certain that axons, on entering amass of gray matter, come into definite functional relations withthe cells located there, or with their dendrites; but the exactmode of connection is often obscure. In certain localities, how-ever, the relations are clear as to certain facts. § 10. The connections of the fibres of the olfactory nerve, forexample, are specially clear. These fibres arise from sensory cells By Bethe, Bielchowsky, Cajal. Bethe, op. cit., pp. Fig. S3.—Nerve-Cell Stained for FibrUs.(Bethe.) a, b, c, d, the stumps of severaldendrites; Ax, stump of the axon. STRUCTURE AND OFFICE OF THE DENDRITES 107 in the mucous membrane of the nose, and, passing through the boneinto the brain cavity, enter the olfactory bulb, where each axonbreaks up into a little bush of branches. Interlacing with theseare the branches of a dendrite which belongs to a cell of the olfac-tory bulb. This dendrite, extending outward from its cell-body,meets the axon coming in from the nose, and the two break up
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