[Dedicated to the memory of my friend Mrs. Susanna PHELPS GAGE] 
FURTHER CONTRIBUTIONS ON NEUROBIOTAXIS 
Ix. AN ATTEMPT TO COMPARE THE PHENOMENA OF NEUROBIOTAXIS 
WITH OTHER PHENOMENA OF TAXIS AND TROPISM. THE 
DYNAMIC POLARIZATION OF THE NEURONE 
C. U. ARIENS KAPPERS 
From The Central Institute for Brain Research, Amsterdam 
SIX FIGURES 
CONTENTS 
Neurobiotaxis and) itsyselective) character, ... 5540. siodudseios selon sis Balaets 261 
Bok’s researches: the stimulogenous formation of the axon................ 267 
Experiments concerning phenomena of tropism and taxis in plants and 
animals: , Katgphoretic phenomena.-.. os. ios2 sys sso pee wal alen seins 270 
Application ef these experiments to the growth of the neuroblast. The 
TORU APLANOL CHELAKOM. Sh ..,. 8 ead cele +. 3 «08S SUA ERE oe eke SE Meee balou ee 25 
The formation and contraction of dendrites. The final shifting of -the 
perikaryon 5 US SRE IOs COLES C Te EI EERE cis An ih AR ROR NA A 279 
Monoaxonismvand poly dendritism sx. sss ir: 4) ats eg neues ae ects toe. sla B's) 3ts 4s 282 
The selectivity in the processes of neurobiotaxis in harmony with psychologi- 
Gaal a oy Scie Rte cca erela Sem ewe pera, oth 4) ce een A Une ras Marsha) Sine a 284 
Fasciculation of axons. Improvement of the nervous path............... 287 
aie forma tion-or the medullary sheath «<p. .5)sih. sce cre treble ls shales chet oe 290 
EN eSTETHC A Gi COC USL Aes tabs te fate =, Bes ete ced eacicet eT ya edareh | SOURIe ES tee wie 293 
NEUROBIOTAXIS AND ITS SELECTIVE CHARACTER 
In various articles,! first in 1907, I have published observations 
concerning the shifting of nerve cells in the central nervous 
system, which could be shown by the different places that 
1 The principal points are mentioned in: 
Die phylogenetische Verlagerungen der motorischen Oblongata-Kerne, ihre 
Ursache und ihre Bedeutung. Neurologisches Centralblatt, 1907, and Rapport 
du Congrés international de Psychiatrie et de Neurologie, Amsterdam, 1907. 
Weitere Mitteilungen iiber die Verlagerungen der motorischen Oblongata- 
Kerne: der Bau des autonomen Systems. Folia Neurobiologica, Bd. 1, 1908. 
Specially in: Weitere Mitteilungen tiber Neurobiotaxis. Die Selektivitit der 
261 
5 
THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 27, NO. 3 
APRIL, 1917 
