98 GENERAL BOTANY 



FIG. 19 

 PHOTOGRAPHED AFTER 12 HOURS 



Growing end of a COLEUS after it has been fixed horizontally 

 and marked to show the region of growth. 



constantly to be met with, curving at the base for some 

 reason or other, but growing straight up afterwards. 

 Branches of trees and shrubs that have been forcibly 

 bent down or half broken often bend up at their ends. 



Observe that it is only the ends which turn up ; and 

 actual proof of this fact can be shown quite easily. 

 Take a quickly-growing annual plant, almost any one 

 will do, so long as it is one which naturally grows up- 

 wards ; cut the leaves off, and with India ink mark, on 

 the internodes at the tip of the shoot, fine lines at equal 

 distances apart, say i in. or J in., according to the 

 size of the plant. Then place it horizontally against a 

 piece of board, on which you may mark its position^ 

 either keeping it in its pot, or with its end in a 

 corked tube of water to keep it alive. Cover it 

 with something to keep off any light, and prevent 



