Phenomena of neurobiotaxis in the optic system 



269 



del único protoplasma indiferenciado que le queda (protoplasma somá- 

 tico), saldrá al encuentro de las fibras de una de estas dos maneras: o 

 mediante apéndices dendríticos nuevos o dislocando el soma, el cual, 

 marchando a guisa de expansión protoplásmica gigante, entrará en 

 contacto con las arborizaciones invasoras.^ (El sistema nervioso del 

 hombre y de los vertebrados, tomo i, página 561, Madrid, IQOI.) 



VII mot. 



I 



Nu. VII ant. tr. tecto-bulb. venlralis 



Fig. I. — Ventral position of the abducens nucleus in the Codfish (Gadus morrhua). 



Or in other terms: «when new axons proceed to a centre, the nerve- 

 cells may acquire a connetion with them, either by a new dendrite, or by 

 shifting of the cellbody inself towards it». 



It was a great pleasure to me confirming this remark of Cajal, spe- 

 cially, as my observations were previous to my knowledge of his state- 

 ment and had led me to the same conclusión, though by another, phylo- 

 genetic, way. 



Contrar\' to CajaFs investigations mine were performed on adult ma- 

 terial, being in full possession of its function, especially on lower animal?, 

 whose brainstructure is simple and easy to examine. 



