Fig. 80.—Electric cell from the middle region of the spinal cord of "Gymnotus", magnified 314 diameters. "a", sheath of neuroglia, the peculiar connective tissue found in the central nervous organs; "b", smaller nerve processes or fibres, forming a network with those of adjoining cells; "c", chief nerve process passing into the axis-cylinder of a nerve-fibre. The nerve-fibre ends in an electric plate, as shown in Life in Motion Fig 76.png, "n".