NEUROBIOTAXIS 297 
This stimulo-petal, kathodic tropism of the dendrites and of the 
perinuclear protoplasm is probably a more complicated phenom- 
enon, which however is not counteracted by K and Cl, since 
this does not occur to any considerable amount in those parts. 
On the other hand, it may be favored by a kathodic kataphoresis 
since it coincides with the appearance of the nuclear acid de- 
rivatives, known as Nissl’s bodies, and does not take place until 
the axon has nearly reached its terminus and the neurone is 
therefore in a much greater state of perfection (Cajal). This 
kathodic tropism, followed by a gradual shortening of the 
dendrite and a displacing of the cell itself (as in most kathodic 
‘tropisms), is in accordance with the phenomena of kathodic 
stimulation, according to Pfliiger’s law (Loeb and Maxwell, 
Boruttau), as these become apparent in animal protoplasm 
susceptible to stimulation (e.g., also in ameba under normal 
circumstances) and causes these parts of the neurone to find their 
way to the electro-negative field which is in a state of stimulation. 
It is probably accompanied by a facilitation of a stimulus- 
transition at that place at the moment when the galvanic cur- 
rent which appears in the nervous system makes itself felt (the 
enhanced sensitiveness at the kathode well known in neurology). 
Thus we find in the first development of stimulo-concurrent 
axons a consequence of the enhanced anodotropic character, 
experimentally proved, of their substance, strengthened by the 
large quantity of K and Cl, while the formation: and contraction 
which takes place much later of the dendrites, and the displace- 
ment of the perinuclear protoplasm to the kathode is a special 
case of Pfliger’s laws, not counteracted by any amount of KCl, 
perhaps even favored by nuclear acid-derivatives. 
Such may be the explanation of the dynamic polarization of the 
neurone. It does not, however, tell us anything about the final 
connection of the axis-clyinder. 
This final connection is always a territory or cell which has a 
correlated activity, that is a simultaneous electrolytic dissociation 
with it. Non-stimulated centers are all equally indifferent to 
it, i.e., corpora aliena to it. We further saw that monoaxonism 
is a result of the effect on the same pole (a resultant line of different 
