A.—Cross section through the central part of a young node.- The vascular bundles are elongated 
radially. There is a great deal of protoxylem. The section shows also some of the smaller 
bundles cut longitudinally (designated by the arrow). X 76 
B —Section through a young internode showing epidermis, cortex, and vascular bundles in 
the state of differentiation. X 468 
