CHLOROPHYL. 



433 



It is necessary to take a thin section or strip from the flattened 

 leaf of Vallisneria, which will exhibit a series of oblong cells, as seen in 

 fig. 210, No. 4. Among the granules a few of a larger and more 



fig. 210. 



1. Branch of Chara vulgaris. 2. Magnified view : the arrows indicate the course 

 taken by the granules in the tubes. 3. A limb of ditto, showing the budding at 

 joints. 4. Portion of a leaf of Vallisneria spiralis, with its cells and granules. 



transparent character than the rest may be seen, having the nucleolus 

 of the cell within them. 



Chara vulgaris is the plant in which the important fact of vegetable 

 circulation was discovered, and in which, from the extreme simplicity 



F F 



