18 



inner layers of the secondary bark must be poorest, thé ou- 

 ter ones richer and the primary bark covering them the 

 richest in alcaloid. This also is confirmed by the Chemi- 

 cal analysis. 



Moens gives the following as results of his analyses: 



Cinchona Calisaya. 



Part belonging to primary bark 

 outer half of „ „ sec. bark 

 inner „ „ „ „ sec. 



2c. Tissues formed by the phéllogen. 



The corkforming tissue arises from the snbepidermal cell- 

 layer. When the cells of this layer are beginning to divide 

 the amount of alcaloid in them decreases, until the new 

 cambium contains no alcaloid at ail (fig. 13G. Pl. XVI). 



The phellodermcells formed by the cambium soon after 

 their originating contain alcaloid, while as a rule a longer 

 time must elapse before the formed corkcells contain any 

 (fig. 137 Pl. XVII); yet exceptions occur as i s se en from 

 the three cells in the middle of fig. 137, where the young 

 corkcell, the cambium cell and the young phelloderm cell 

 al] three contain alcaloid. Somewhat older, nucleated, li- 

 ving corkcells contain considérable quantifies of alcaloid 

 (c. fig. 133, 134, Pl. XV. fig. 139 Pl. XVI). 



The filling-up tissue of the lenticells is conspicuous by 

 its comparatively large amount of alcaloid yet the under- 

 lying phellodermcells contain even more; (c. fig. 138 Pl. 

 XVI). old, dead, corkcells contain no alcaloid. i 1 ) 



In those parts of the primary and secondary bark which 



5- 6% 

 5. 36" 

 2. 71" 



f 1 ) At least not in their lumen, possibly their membranes are impregna- 

 ted with it but this can not be shown microchemically. 



