28 



At a former occasion I called attention to the fact that 

 quantifies expressed in percentages of the dry matter are 

 no measure for the absolute quantity présent in an organ. 



If we suppose that a young leaf of C. Succirubra con- 

 tains l°/ 0 of alcaloid and an adult one of the same tree 

 0.1°/ o it remains possible yet that the adult leaf contains 

 more alcaloid than the young one. 



For example: The dry weight of a young leaf of C. Succi- 

 rubra was found to be 250 milligrams, while that of an adult 

 one of the same tree amounted to 3 gram or 3000 milligram. 



A young leaf containing l°/ 0 of alcaloid consequently 

 contains 2,5 milligram, an old one of but 1 / 10 °/ 0 of al- 

 caloid contains 3 milligram. 



Or, although the percentage of alcaloid contained in an adult 

 leaf is but one tenth of that in a young leaf, yet more alca- 

 caloid is présent in an adult than in a young leaf. 



Now let us calculate the quantity of alcaloid to be deli- 

 vered daily by the leaves necessary to supply the quantity 

 présent in the bark! 



Ai] adult tree of C. Succirubra contains about 700 gram. of 

 alcaloid in the bark asisclearfromthefollowingcalculation. 



Moens i 1 ) gives for the production of C. S. trees of 9 years 

 old, under favorable conditions 9.38 KG. of dry bark, 6.92 

 KG. of which were stembark — 1 KG. bark of branches 

 and 1.4G KG. of rootbark. 



This is certainly a fine production for trees of 9 years 

 of âge as others mention for 8 year old trees 3 KG. 



After Moens ( 2 ): 

 C. Succirubra.: Stembark lst. Kind contains 7.7°/ 0 of alcaloid 

 bark of the branches 3.5 „ 

 rootbark 9.1 



(i) 1. c. p. 226 

 (-)l.c.p 270/71 



