TRILLIUM RECUR VA TC'.V. 2 1 1 



4. The epidermis. Note 



a. The shape and irregularity of the cells on the 

 upper side of the leaf. 



b. The shape and irregularity of the cells on the 

 lower side, together with the shape of 



c. The numerous stomata in transverse section, when 

 cut through the middle, and when through the 

 ends. 



5. Draw a part of the mesophyll and epidermis, extend- 

 ing from one side of the leaf to the other. 



6. The reins. Selecting a vein of moderate size, note 



a. The small epidermal cells on the upper side, and 

 the large ones on the lower side, both more thick- 

 ened and regular than elsewhere on the leaf. 



b. The fibro-rasculiir bundle, with the xylem area 

 toward the upper side, and the phloem area toward 

 the lower side 4 : sometimes with 



c. Fundamental parenchyma interposed between the 

 bundle and the epidermis on either side. 



d. Draw a vein. 



Strip some epidermis from the upper side of the leaf, 

 and some from the lower side, and notice 



7. The shape and arrangement of the cells of the two sur- 

 faces, and the abundance of stomata. Draw. 



E. THE FLOWER. 



i. The sepals. Make a transverse section through the 

 middle of a sepal, and notice 



a. The several parts and tissues seen in the leaf. 

 Draw. 



4 Note how this follows from the relative positions of xylem and 

 phloem in the stem. 



