PLATE YI. 2 26 
Fic. 30.—Cross section of a secondary root; d, brown scaly cork; 
c, cork, the cells colored reddish brown; k, phellogen; g, cambium; the 
bast fibers are shown by black dots and the water tubes by circles. » 41. 
Fic. 31—Cross section of xylem of root; wt, water tube; t, tracheid; 
mr, medullary ray. x 375. ‘ 
Figs. 32, 33, 34.—Tracheids from root. x 288. 
Fig. 35.—Cross section of a portion of a root; 0, cork; m, phellogen; 
y, thin-walled parenchyma. x 325. 
Fic. 36.—Bast fiber from root. x 180. 
