No. 454.] STUDIES ON THE PLANT C 



method of growth a process of erui)tion in ci 

 conception of growth by intussusception, hu 



older wall and is consequent] \ growth by apix 

 is very favorable for such investigations and \i 

 strengthen the theory that a t'ellulose wall 

 direct transformation of a plasma nunibrane 

 hydrate molecules gradually replace those ol 

 rial. Accordingly the cellulose wall is not s 

 and its growtb is not by the intercalation < 

 among the old (intussusception) in a non-lixini 

 The wide space in the interior ol the tilai 

 and some other members of the Siplmnalo is 

 by cellulose bars at various angles. 1 licse a 

 of protoplasm which become graduall)- lilK-t 

 drate material and finally solidified. Noll ( 



the tilament, believes that they are also the p; 

 exchange between the interior regions of tlv 

 the \Vater outside the plant. They are sc 

 plasma membrane which in conse(|uence prescr 

 extent of surface to the water permeat in- the 



It is plain that because of the cnn>laiit 

 granular cytoplasm carrying with it the n 



