The axis cylinders of all nerve fibers (motor, secretory, sensitive and sensory, conducting centrifugally or centripetally) have been proved to proceed directly from the cells. A connection with a fiber network, or an origin from such a network, does not take place.

'Über einige neuere Forschungen im Gebiete der Anatomie des Centralnervensystems', Deutsche Medizinische Wochenschrift, 1891, 17, 1352. Trans. Edwin Clarke and L. S. Jacyna, Nineteenth Century Origins of Neuroscientific Concepts (1987)