262 Cc. U. ARIENS KAPPERS 
the motor nuclei of the oblongata exhibit in the series of 
vertebrates. 
Ontogenetically the same phenomenon could be stated. Since 
it was most evident that the shifting of these central groups 
took place in the direction of the point whence the majority 
of stimuli proceeded to their cell:, we apparently had to do with 
a phenomenon of taxis or tropism, which I called Neurobiotaxis, 
because it occurs in the nervous system during life (in its phylo- 
genetic and ontogenetic development) and I did not know where 
Zellen-Wanderung. Die Bedeutung synchronischer Reizverwandtschaft, etc. 
Folia Neurobiologica, Bd. 1, 1908. 
Uber die Bildung von Faserverbindungen auf Grund von simultanen und 
sukzessiven Reizen. Bericht des III. Kongresses fiir experimentelle Psycho- 
logie in Frankfort am Main, 1908. ; 
Further anatomical details are found in: 
Weitere Mitteilungen iiber Neurobiotaxis, Il. Die phylogenetische Entwick- 
Jung des horizontalen Schenkels des Facialiswurzelknies. Folia Neurobio- 
logica, Bd. 2, 1908. 
Weitere Mitteilungen iiber Neurobiotaxis, ITI. Uber den Hinfluss der Neurone 
der Geschmackskerne auf den motorischen Facialis und Glossopharyngeuskern 
und ihr Verhalten zur Radix descendens Nervi quinti. Folia Neurobiologica, 
Bd. 3, 1909. p 
Weitere Mitteilungen iiber Neurobiotaxis, IV. The migrations of the abducens 
nucleus and the concomitating changes of its root-fibers. Psychiatrische en 
Neurologische Bladen, Amsterdam, 1910. 
The migrations of the motor cells of the bulbar Trigeminus, Abducens, and 
Facialis in the series of vertebrates and the differences in the course of their 
root-fibers (counted as Mitteilung V.). Verhandelingen der Kon. Akad. v. 
Wetenschappen, Amsterdam. Tweede Sectie, Deel 16, Nr. 4, 1910. 
Weitere Mitteilungen tiber Neurobiotaxis, VI. The migrations of the motor 
root-cells of the vagus group and the phylogenetic differentiation of the hypo- 
glossus nucleus from the spino-occipital system. Psychiatrische en Neurologische 
Bladen, Amsterdam, 1911. 
Weitere Mitteilungen tiber Neurobiotaxis, VII. Die phylogenetische Ent- 
wicklung der motorischen Wurzelkerne in Oblongata und Mittelhirn. Folia 
Neurobiologica, Bd. 6, Sommergiingzungsheft, 1912. 
Weitere Mitteilungen iiber Neurobiotaxis, VIII. Uber den motorischen 
Facialis und Glossopharyngeus Wurzel bei niederen Vertebraten. Folia Neuro- 
biologica, Bd. 9, 1912. 
The structure of the autonomic nervous system compared with its functional 
activity. Journal of Physiology (England), vol. 37, 1908, p. 139. , 
Phenomena of neurobiotaxis in the central nervous system. Section Anatomy 
and Embryology, of the XVITth International Congress of Medicine, London, 1913. 
