CELLS. 
23 
stem of the Leek , represented by Fig. 1 1 , the nucleus 
a , and nucleolus b, are easily recognized. 
FIG. 10 . 
FIG. 11 . 
Cells of a Leelc : a, nucleus ; b, nu- 
cleolus. 
It would, I fear, occupy too much time to exhibit to 
you each of the varieties of cells before enumerated ; but, 
in this section of the leaf of a Balsam (Fig. 12), and 
FIG. 12 , 
Vertical section of the leaf of a Balsam ; a 1 cells from the 
stem of the same plant. 
in the mass a, from the stem of the same plant, most 
of the forms may be distinguished, more especially the 
