29 



or, a C. S. of 9 years contains in the stembark 532. 84 gr. 



in the branches 35. 7 , 

 in the root 132. 86 „ 



Total 700. 70 „ 



Consequently we get this calculation: 



Total alcaloid produced in 9 years: 



700. 70gr=700700 milligram 



or for every day an average of 



700700 , oin .... 

 — — — — = + 210 milligram. 



328o 



Accepting 3 grams to be the weight of adult C. S. Iea- 

 ves and them to contain 1 / 10 of a percent of alcaloid, every 

 leaf contains 3 milligram or 70 (seventy) leaves would be 

 sufficient to produce the quantity of alcaloid présent in the 

 bark of C. S. provided they transport every day the quan- 

 tity of alcaloid présent in them. 



On a very poor, weak C. S. of about 6 years on Tjinjiroe- 

 an I counted 781 leaves, on a well developped tree estimated 

 at 12 years 3155 leaves. This last tree consequently, if emp- 

 tying its leaves every day, would be able to form 3.5 KG. 

 of alcaloid a year. 



On a tree of C. Ledgeriana of Tirtasari I counted 10971 

 leaves and found for the average weight of a dry leaf 

 somewhat more than 0,5 gr. Accepting 10.000 to be the 

 number of leaves, the dry weight of one leaf being 0.5 gr., 

 we obtain for that tree 5000 gr. of leaf weight. Accepting 

 quantity of alcaloid présent in the leaves to be 1 / 10 i 1 ) of 

 the a percent, we see that 5 grams of alcaloid could be 



f 1 ) De Vry found 0.192 % consequently considerably more. Besides it is 

 well to bear in mind that the quantity of alcaloid found in a leaf signifies 

 only the remnant remaining at that particular moment, while a continuous 

 transportation takes place. Consequently a leaf containing at a certain mo- 

 ment 3 milligrams of alcaloid may have transported considerably more than 

 3 milligrams towards the stem that day. 



