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ing, parenchyma cells. This region also contains the ducts, which vary 
from none to two in number. It appears as if the number of ducts should 
be two, if the leaf be bi-laterally symmetrical. However, in Picea Cana- 
densis never more than one duct was found in a single leaf. Dissatisfied 
PICKA PUNGENS. 
D Duets. E Epidermis. 
S Strength. cells. M Mesophyll. 
F Fibro-vas. bundle. B Bundle sheath. 
O Stomata. 
with this variation of the number of ducts, sections were made through 
the entire leaf. From these sections it was found that the duct did not 
extend the entire length of the leaf, but was somewhat spindle-shaped, 
