54 



NOTES ON DIPTEROCARPS. 



Figures 22-27, sections through 

 an embryo of Dipterocarpus fagineus; 



Figures 28-30, ditto, through an 

 embyo of Dipterocarpus cornutus. 



i ft. I 



It seems worthy of notice that in the folding of the coty- 

 ledons in the largest fruited of these three an extra curve is called 

 into being (figure 28) indicated only just in the smaller embryo of 

 Dipterocarpus fagineus (figure 22). 



Twin seeds in Dipterocarpus cornutus exhibited an S-folding. 

 Did it result from the intensified and abnormal pressure from com- 

 petition within the ovary? It became complicated by extra folds. 



Figures 31, 32, and 33, sections through twin seeds in 

 Dipterocarpus cornutus in three levels. 



The apices of the cotyledons in the genus Dipterocarpus not 

 uncommonly abut against an small lump of resin which acts as 

 ballast when the fruits fall. 



Jour. Straits Branch 



