BARLY GROWTH. 41 
check the young growth, which would, however, 
be resumed on the resumption of the necessary 
condition; but the entire absence of moisture, 
through the aridity of the soil, would be fatal in 
its effect, because the root hairs would cease to 
perform their functions, and the plantlet would 
shrivel and die. 
At this stage of our history of the progress of 
growth in the Tree germ we must pause for some 
explanation as to the nature of the substances 
of which the vegetable organs to which we have 
referred are composed. 
