PLATE LXXI. 



Figs. 37 to 42, inclusive. A series of cross sections of the stem start- 

 ing just above the base of the terminal bud and proceeding downward, 

 showing how the rings of vascular bundles of three separate buds merge 

 into the one ring of the stem which bears them. The xylem and bast 

 fibers are colored black. X 13.5. 



Fig. 37. Cross section showing the vascular bundles of two buds, s 

 and t. The outer bud scales have been removed: I, leaf. X 13.5. 



Fig. 38. s and t are closer together. There is stem tissue instead of 

 leaves between them. X 13.5. 



Fig. 39. s and n are approaching t. X 13.5. 



Fig. 40. The ring, t, is opening to receive s and n. X 13.5. 



