"med 
* 
nel 
7 
88 FOUNDATIONS OF BOTANY 
Note: 
(a) The general outline of the section. 
(6) The number and arrangement of the bundles. (How 
many kinds of bundles are there?) 
(c) The comparative areas occupied by the woody part of the 
bundle and by the part which belongs to the bark. » 
(d) The way in which the pith and the outer bark are con- 
nected (and the bundles separated) by the medullary rays. 
4 
MIL 
ion) 
ane 
pera 
Gm 
; 
yy, 
Fy) 
Fic. 57.— One Bundle from the Preceding Figure. (x 100.) 
w, wood-cells ; d, ducts. The other letters are as in Fig. 56. Many sieve-cells 
occur in the region just outside of the cambium of the bundle. 
Examine a longitudinal section of the same kind of stem, to find 
out more accurately of what kinds of cells the pith, the bundles, and 
the outer bark are built. Which portion has cells that are nearly 
equal in shape, as seen in both sections? 
