Jackson. — Anatomical Structure of the Roots of Barley . 35 
Slight Thickening. 
Medium " 
A. Branched Root. i, near grain, 
2, middle of root. 3, behind root-tip. 
B. ‘ Transition Root.' 1, near grain. 
2 a, middle of root. 2 b, middle o? root 
nearer root-tip. 3, behind root-tip. 
C. * Unbranched ' 1 Root. 1, near grain. 
2, middle of root. 3, behind root-tip. 
Very heavy 
Fig. 12. Barley. Diagrams showing stelar structure of the different types of roots. 
