THE PLANT CELL. 



stained in a special manner this distinction can sometimes be 

 made out, but in the living cell it is not easy to do so, except in 

 such cases as Aethalium* or Amctha (an animal organism not 

 unlike Aethalium), where the demarcation is very distinct (see 

 Fig. 2). In such a cell, which is a naked mass of protoplasm, 

 the ectoplasm is capable of responding to stinmli, protrusions 

 known as pseudopodia being pushed out in all directions ; it is 



Fig. 1. — A Single Cell from a Root-Tip, fixed, and stained to 

 SHOW THE VARIOUS PARTS. — A, Cell Wall ; B, protoplasm, here 

 granular, owing to coagulation, and partly to the presence of 

 microsomata ; C, vacuoles filled with cell sap ; D, the nucleus : the 

 clear part just outside the nuclear membrane may be taken to 

 represent the kinoplasm ; E, chromatin particles arranged upon a 

 network of linin, the latter being faintly represented ; F, nucleoli 

 (plasmosomes) ; G, the centrosomes (probably absent in higher plants). 



probable, however, that it is the endoplasm which receives the 

 stimulus, which, after it has passed into the cell by way of 



• One of the Myxomycetes. 



