FIG. 68. One bundle from the preceding figure 



V), wood cells ; d, vessels. The other letters are as in Fig. 57. Sieve cells occur 

 in the soft bast region outside of the cambium of the bundle, x 100 



e ck 



c w d m 



d 



. 



FIG. 59. Stem of box elder one year old 



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

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

 p, pith. Much magnified 



61 



