217 
Seedling Structure of Gymnosperms . II. 
without any previous fusion and subsequent splitting. These changes lead 
to the formation of two bands of vascular tissue, each of which immediately 
divides into two parts. Avoiding subsidiary features for the time being, these 
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Diagram ii. Araucaria brasiliensis. 
four strands each have an endarch protoxylem, a point to which Masters 1 
has drawn attention, which gradually becomes concentrated towards the 
outer parts until its position is fully exarch (Diagram n, Figs. 8-10 and 
1 Masters, 1891, loc. cit. 
