308 VEGETABLE PHYSIOLOGY 



for as we shall see, in growing cells and members there is 

 a constant stretching of the cell or tissue by hydrostatic 

 pressure or turgidity, which can be distinguished from 

 growth by the fact that it can be removed, the result 

 being a certain diminution of the size of the part under 

 consideration. 



FIG. 137. PORTION OF SECTION OF STEM OF EUSH, SHOWING STELLATE 

 TISSUE OF THE PITH, WITH LARGE INTERCELLULAR SPACES. , ~~ 



Growth in the lowliest plants may be co-extensive with 

 the plant -body. In all plants of any considerable size 

 however it is localised in particular regions, and in them 

 it is associated with the formation of new protoplasts. We 

 have already mentioned that in the sporophytes of all 

 the higher plants there exist certain regions in which 



