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Explanations of Plates. 

 Plate I. 



Fig. \. Developing leaf showing horizontal plane from which the segments running 



vertically arise. Segments do not run throiigh to the periphery of 



blade. X 80- 

 Fig. 2. Stage like above showing the tip ending in a nuniber of braiiched hairs, X 80. 



Fig. 3. Later stage, segments hâve beconie triangular in form — only 6 segments 



on one side of the leaf. X 80. 

 Fig. 4. Plane of origin of the leaflets shifting to the vertical — thèse leaves will 



develop into pinnate leaves with the indicated number of pinnae. X 80. 



Fig. 5. Ditto. X 75. 



Fig. 6. Young leaf with increasing number of leaflets. The tip is still strongly 



developed. In the unfolded state the tip wili be characteristically dichoto- 

 mous. X 75. 



Fig. 7. Lanceolate leaf of the young seedling showing no outward segmen- 



tation. X 1. 



Plate II. 



Fig. 8. Young developing leaf with part of sheath eut away to show the coneshaped 

 character of the leaf. The two halves of the blade showing the slits are 

 seen, also the bonnet like appearance of the part of the leaf bearing the 

 leaf blade. From a plant l'/z years old. X 60. 



Fig. 9. The same leaf in front view. X 60. 



