PUATE, Ve> 
Fic. 20.—Longitudinal radial section of stem medullary ray. > 475. 
Fic. 21.—Longitudinal tangential section of stem medullary ray. 
x 475. 
Fic. 22.—Longitudinal tangential section of stem wood parenchyma. 
x 475. 
Fic. 23.—Cross section of stem tracheids; and wood parenchyma, w. 
b eu Gy 
Fic. 24.—Cross section of a small portion of a root; p, phloém; e, 
cambium; m, medullary ray; «, xylem. » 325. 
Pig. 25.—Pith from cross section of one-year-old stem. X 3825. 
Fic. 26.—Longitudinal section of a stem water tube. x 288. 
Fic. 27.—Surface view of a small portion of a water tube. x 288. 
Fic. 28.—Tracheids and parenchyma cells from a leaf cut longi- 
tudinally through the broad diameter. > 475. 
Fic. 29.—Cambiform cells from the phloém of a leaf, cut longi- 
tudinally through the narrow diameter. x 325. 
