FIG. 58. One bundle from the preceding figure 



to, wood cells ; d, vessels. The other letters are as in Fig. 57. Many sieve cells 

 occur in the region just outside of the cambium of the bundle, x 100 



B 





FIG. 59. Stem of box elder one year old 



A, lengthwise (radial) section; B, cross section; e, epidermis; ck, cork; b, hard 

 bast; 5, sieve cells; c, cambium; w, wood cells; w, medullary rays; d, vessels; 

 p, pith. Much magnified 



61 



