GROWTH 318 
by permanent change of form. It is the process of passing 
from the embryonic to the adult condition. We must not 
assume that every increase of bulk is necessarily growth ; 
for, as we shall see, in growing cells and members there is 
a constant stretching of the cell or tissue by hydrostatic 
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Fie. 1356.—Portion oF Srction or Stem oF RvUSH, SHOWING STELLATE 
TIssUE OF THE PITH, witH LARGE INTERCELLULAR SPACES. 
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 sizeof the part under consideration. 
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 
