186 Intracellular Transmission of Characters 



in some definite part of their circumferences.^^ He did 

 so partly where, through locaHzed surface growth, the 

 shape of the cells changes, partly where unilateral thick- 

 enings of the membranes, or a definite wall sculpture are 

 started. And although, owing to the abundance of in- 

 dividual phenomena, a rule without exceptions could not 

 be expected, he found, on the whole, that the nucleus most 

 frequently turns to where growth is strongest, and re- 

 mains longest where the latter continues longest. 



According to Korschelt, the same rule is valid, in a 

 general way, for the animal cell.^* With chiefly unilateral 

 or local activity of the cells, this investigator succeeded, 

 in a number of cases, in observing for the nucleus a defi- 

 nite position which was as near as possible to the place 

 where this process was going on. Frequently, when the 

 distance is more considerable, the nucleus is connected 

 with such favored places by bands and accumulations of 

 protoplasm. 



Where the nucleus does not betray its influence on 

 the processes in the protoplasm by a change of position, 

 it does so frequently by a definite arrangement of the 

 latter around the nucleus. The accumulation of the amy- 

 loplasts in the immediate vicinity of the nucleus, as is 

 frequently observed in young cells, has been ascribed by 

 various investigators to the influence of the nucleus on 

 their activity.^ Pringsheim has demonstrated that, in 



s^Haberlandt, G. Ueher die Bez'iehungen zivischen Funktion und 

 Lage des Zellkernes. 1887. 



3*Korschelt, E. G. Haberlandt, Ucber die Beziehungen zwischen 

 Funktion und Lage des Zellkerns bei Pflanzen, Jena, 1887, nebst 

 einigen Mitteilungen. Biol Cent. 8; 110. 1888. 



s^Cf. e. g. Strasburger, Ucber Kern und Zelltheilung, p. 195. 

 1888. Schimper, A.F.W. Untersuchungen iiber die Chlorophyll- 

 korper, und die ihnen homologen Gebilde. Jahrb. IViss. Bot. 16: 

 1. 1885. Haberlandt, G. Die Chlorophyllkorper der Selaginellen. 

 Flora. 71:291. 1888. 



