20 



As soon as the pericycle begins to form phellogen, this 

 phellogen and the young corkcells formée! by it or the lat- 

 ter only, may contain alcaloid; (fig. 143 Pl. XVJI at x). 

 As is known the action of the phellogen throws of the 

 primary rootbark (fig. 143 Pl. XVII. ). In the cells ofthe 

 primary root Janse's endophyte is found. 



After throwing of the primary bark nothing remains 

 outside of the central cilinder but the secondary bark, which 

 even on a very young stage contains some alcaloid. 



Later on this rootbark resembles the stembark greatly, 

 only no primary bark is found on its exterior side. The 

 alcaloid is hère localised in exactly the same manner as 

 in the stembark. (comp. fig. 130 with fig. 131 Pl. XIV and 

 fig. 146 Pl. XVIII). 



The secondary wood of the root contains alcaloid as does 

 the stemwood in the medullary rays, its prolongations and 

 woodparenchyma. 



d. The organs of Reproduction. 



In meristematical condition the différent parts of the flo- 

 wer contain no alcaloid. In the same way as in the leaves 

 the alcaloid appears gradually in corolla and calyx. Here 

 also a maximum is met with at an early âge. Adult petals 

 and sepals however contain more alcaloid in each cell than 

 do adult végétative leaves. 



The epiderm of the calyx contains no alcaloid, the sup- 

 epidermal layer contains more alcaloid than any other 

 one. It can be said that in a gênerai way the external pa- 

 renchyma contains more alcaloid than the internai one, 

 this differs however in différent flowei s. Fig. 149. Pl. XIX 

 pictures a fair average. The corollar leaves contain no al- 

 caloid in the epiderm and in them also the external pa- 

 renchyma contains more alcaloid than the internai one does. 

 At this stage the stamens show alcaloid in the connective 



