NOTES ON DIPTEROCARPS. 



45 



which follow are solitary. The four leaves of the whorl were fully 

 developed in September, i.e. at three months and the fifth leaf 

 generally in December or January, i.e. at six months. 



Cot Scat-.* 



Fig. 4. Seedling 

 a the time of the 

 unfolding of the 

 fifth leaf: Cot. Scar, 

 the scar whence 

 the cotyledons have 

 fallen is seen below. 



It is of particular interest that among the four leaves, in- 

 equality is found, that two are commonly larger than the others, — 

 two which are not opposite, but contiguous, being those over the 

 lesser cotyledon (fig. 6). The inequality is already obvious before 

 the leaf -blades have expanded, and persists through life (figs. 7, 

 and 8) ; but is sometimes very slight (figs. 9 and 10). 



-Ixot 



f -Sm.cot 



Pig. 5. The seedling as the cotyledons 

 separate, seen obliquely from above : 

 I. cot. larger cotvledon ; sm. cot. lesser 

 cotyledon. 



R. A. Soc, No. 75, 1917. 



Fig 6. Seedling as the leaves of the 

 whorl separate, seen from above ; I. pair-, 

 larger pair of leaves. 



