The Influence of the Nucleus in the Cell 185 



tion. Ordinarily, it does not take any definite position 

 after this, but is moved around in the cell by the cur- 

 rents of the granular plasm. As Hanstein describes it, 

 the nucleus traverses a long and very tortuous way within 

 a few hours, and sails in all directions throughout its 

 whole domain, ''as if to inspect it everywhere. "^*^ Every- 

 thing argues for the assumption that the activity of the 

 entire protoplast is under the regulating influence of the 

 nucleus. ^^ 



Besides the general behavior of the nuclei the in- 

 vestigations of Tangl, Haberlandt, Korschelt, and others, 

 have made us acquainted in recent years with a special 

 relation of the nuclei to individual processes in cell-life. 



Tangl observed bulb-scales of Alliimi Cepa, which had 

 been recently wounded, for example, the day before.^^ He 

 saw that near the wound-surface the nuclei are not, as 

 otherwise, irregularly distributed over the cells, but that 

 they had gone to that side of their cells which was nearest 

 to the wound. With them the granular plasm was also 

 accumulated on those walls. The shorter the distance 

 from the wound, the more pronounced was the phenom- 

 enon, but as far away as about 0.5 mm. it could still 

 be distinctly seen. These conditions probably indicate 

 that the process of regeneration which the wounds usually 

 cause proceed here, under the influence of the nuclei. 



Haberlandt studied the position of the nucleus during 

 this process in a great number of cases in which the cells 

 of the higher plants show a more vigorous local growth 



30Hanstein, Das Protoplasma. 1: 165. 1880. 



3iCf. Strasburger. Neue Untersuchungen. p. 125. 1884. 



32Tangl, E. Ziir Lehre von der Continuitat des Protoplasmas 

 im Pflanzengewebe. Sitzh. Math.-Naturw. CI. Akad. Wiss. Wien. 

 90: 10. 1884. 



