268 Cc. U. ARIENS KAPPERS 
Bok, considering the fact that the formation of the axis- 
cylinders in those cells took place under the influence of the 
current irradiating from the primary activating axis-cylinder, 
ealled this stimulogenous fibrillation, following the direction of 
that current in contrast to the outgrowth of the dendrites and 
Activated neuroblasts 
cells 
Activating primary jascicle 
Fig. 4 The activation of adjacent neuroblasts by an amyelinated (growing) 
fascicle. The vertical arrow indicates the direction of growth of the activating 
bundle and the direction of its nerve current, which starts at A. The horizontal 
arrow indicates the course of the irradiating influence (current) perpendicularly . 
to the activating bundle. Notice that the proximal cells are sooner activated 
(and have moved further) than the more distant ones. After Bok. 
